40题计算机程序设计基础(C语言)编程习题
注意:部分代碼雙引號中英文有問題,自己調整!
1.輸入2個整數,求兩數的平方和并輸出。?
??#include <stdio.h>
???main()
{ int ?a,b,s; ?
?printf("please input a,b:\n");
?scanf("%d%d",&a,&b);
?s=a*a+b*b;
????printf("the result ?is %d\n",s);
?} ?
2. 輸入一個圓半徑(r)當r>=0時,計算并輸出圓的面積和周長,否則,輸出提示信息。
#include <stdio.h>
???#define PI 3.14 <stdio.h>
main()
{ float ?r ,s , l; ?
?printf("please input r:\n");
?scanf("%f",&r);
if (r>=0) ???????????????????????
??{s=pi*r*r;
??????l=2*i*r ;
??printf("the area is %f\n",s);
printf("the circumference is %f\n",l);}
else ?
printf("input error!\n");
?} ?
3、函數y=f(x)可表示為:
???????????????????2x+1 ??(x<0)
?????????????y= ???0 ????(x=0)
???????????????????2x-1 ?(x>0)
編程實現輸入一個x值,輸出y值。??
main()
{int x,y;
scanf("%d",&x);
If(x<0)y=2*x+1;
If(x>0)y=2*x-1;
If(x==0) y=0;
printf(“%d”,y);}
4、編寫一個程序,從4個整數中找出最小的數,并顯示此數。
main( )
{int a,b,c,d,t;
?scanf ("%d,%d,%d,%d",&a,&b,&c,&d);
?if (a>b)
???{t=a; a=b; b=t;}
?if (a>c)
???{t=a; a=c; c=t;}
?if (a>d)
???{t=a; a=d; d=t;}
?printf ("min = %d \n",a);
}
5.有一函數當x<0時y=1,當x>0時,y=3,當x=0時y=5,編程,從鍵盤輸入一個x值,輸出y值。
main()
{int x,y;
scanf("%d",&x);
if (x<0) y=1;
else if(x==0) y=5;
else y=3;
printf("x=%d,y=%d\n",x,y);}
?
6.從鍵盤輸入兩個數,求出其最大值(要求使用函數完成求最大值,并在主函數中調用該函數)
main()
{float max(float x,float y); ????
float a,b,m;
scanf("%f,%f",&a,&b);
m=max(a,b);
printf("Max is %f\n",m);
}
float max(float x,float y)
{
float temp;
if (x<y)
{temp=x;
???????x=y;
?y=temp;
}
return(x);
}
7、從鍵盤輸入你和你朋友的年齡,編成判斷誰的年齡最大,并打印最大者的年齡。
#include ?<stdio.h>
main()
{ int ?yourAge, hisAge;
printf("Please enter your age:");
scanf("%d", &yourAge); ??????/*輸入你的年齡yourAge*/
printf("Please enter your friend's age:");
scanf("%d", &hisAge); ??????/*輸入你朋友的年齡hisAge*/
if (yourAge >= hisAge)
{
printf("You are older! Your age is = %d\n", yourAge); ?
}
if (hisAge > yourAge)
{
printf("Your friend is older! HisAge age is = %d\n", hisAge);
}}
8、鍵盤輸入2個加數,再輸入答案,如果正確,顯示“right”,否則顯示“error”
#include “stdio.h”
main( )
{int a,b,c;
?printf(“please input a and b\n”);
scanf (%d,%d”,&a,&b);
?printf(“please input the answer for a+b\n”);
scanf (%d”,&c);
?if (c==a+b)
?????printf(“right\n”);
?else
?????printf(“error\n”);
}?
9. 編一程序每個月根據每個月上網時間計算上網費用,計算方法如下:? ? ? ? ? ? ??
要求當輸入每月上網小時數,顯示該月總的上網費用(6分)
main()
?{ int hour;
??float fee;
??printf(“please input hour:\n”);
?scanf(“%d”,&hour);
?if(hour<=10)
???fee=30;
?else if(hour>=10&&hour<=50)
??fee=3*hour;
?else fee=hour*2.5;
?printf(“The total fee is %f”,fee);
}
10.神州行用戶無月租費,話費每分鐘0.6元,全球通用戶月租費50元,話費每分鐘0. 4元。輸入一個月的通話時間,分別計算出兩種方式的費用,判斷哪一種合適。
????main()
??{float a,x,y;
???printf(“\n請輸入您的話費:”);
???scanf(“%f,”,&a);
???x= 0.6*a;
???y=50+0.4*a; ????
???printf (“神州行話費為: %f\n”,x);
printf (“全球通話費為: %f\n”,y);
if (x>=y)
??????printf(“建議使用全球通”);
???else printf(“建議使用神州行);
????}
11.個人所得稅計算,應納稅款的計算公式如下:
收入 | 稅率 |
收入<=1000元部分 | 0% |
2000元>=收入>1000元的部分 | 5% |
3000元>=收入>2000元的部分 | 10% |
6000元>=收入>3000元的部分 | 15% |
收入>6000元的部分 | 20% |
輸入某人的收入,計算出應納稅額及實際得到的報酬。(7分)
(如需連續計算多個人的納稅情況,直到輸入負數為止,程序應如何改進?試寫出程序)
#include “stdio.h”
main()
{
??int grade;
??float income,tax,money;
??printf(“please input your income\n”);
scanf (“%f”,&income);
??if (income<0)
??????printf(“the input is error”);
??else
{ grade=(int)income/1000;
??switch(grade)
??????{ case 0 : tax=0;break;
????????case 1 : tax=(income-1000)*0.05;break;
????????case 2 : tax=50+(income-2000)*0.1;break;
????????case 3 :
case 4 :
case 5 : tax=150+(income-3000)*0.15;break;
default: tax=600+(income-6000)*0.2;
?????????????????}
???????????money=income-tax;
???????printf(“\n tax=%f, money=%f”,tax, money);
??????}
}
12.從鍵盤上輸入一個百分制成績score,按下列原則輸出其等級:score≥90,等級為A;80≤score<90,等級為B;70≤score<80,等級為C;60≤score<70,等級為D;score<60,等級為E。
?#include <stdio.h>
main()
{
int ???data; ?????????
char ?grade; ???????????????????
printf("Please enter the score:");
scanf("%d”, &data); ?
switch(data/10) ??????????????????
{ ??case 10: ?
???????case 9 : ?grade=’A’; ?break;
case 8: ?grade=’B’; ??break;
case 7: ?grade=’C’; ??break;
???????case 6: ?grade=’D’; ??break;
default: ?grade=’E’;
}
????printf("the grade is %c”,grade);
}
?
*13. 編程設計一個簡單的計算器程序。從鍵盤輸入2個操作數,1個運算符,當運算符為加(+)、減(-)、乘(*)、除(/)時,輸出計算結果
??#include <stdio.h>
main()
{ int ?data1, data2; ?????????/*定義兩個操作符*/
char ?op; ?????????????????????/*定義運算符*/
printf("Please enter the expression:");
scanf("%d%c%d", &data1, &op, &data2); ?/*輸入運算表達式*/
switch(op) ???????????????????/*根據輸入的運算符確定要執行的運算*/
{ ?case '+': ????????????????????????/*處理加法*/
printf("%d + %d = %d \n", data1, data2, data1 + data2);
break;
case '-': ????????????????????????/*處理減法*/
printf("%d - %d = %d \n", data1, data2, data1 - data2);
break;
case '*': ????????????????????????/*處理乘法*/
printf("%d * %d = %d \n", data1, data2, data1 * data2);
break;
case '/': ????????????????????????/*處理除法*/
if (0 == data2) ?/*為避免出現溢出錯誤,檢驗除數是否為0*/
printf("Division by zero!\n");
else ?
??printf("%d / %d = %d \n", data1, data2, data1 / data2);
break;
default:
printf("Unknown operator! \n");
}
}
14. 從鍵盤輸入10個整數,統計其中正數、負數和零的個數,并在屏幕上輸出。
main( )
?{int a[10], i,p=0,n=0,z=0;
??printf(“please input number”);
for(i=0;i<10;i++)
{scanf(“%d,”,&a[i]);
??if (a[i]>0)
??????p++;
else if (a[i]<0)
??????n++;
else z++}
??printf(“正數:%5d, 負數:%5d,零:%5d\n”,p,n,z);
}
}
15、編程序實現求1-200之間的所有數的乘積并輸出。
#include <stdio.h>
???main( )
???{ ?int ?i, sum=1
??????for(i=1; i<200 i=i+1)
??????????sum=sum*i;
??????printf(“the sum of odd is :%d”,sum);
}
16. 從鍵盤上輸入10個數,求其平均值。
?main()
{
int ?a[10],i,s=0; ????????????????
float ave;; ?????????????????
for(i=0;i<10;i++)
scanf(“%d”,&a[i]);
for(i=0;i<10;i++)
???sum+=a[i];
????ave=(float)sum/10;
printf("ave = %f\n", ave);
}
17、編程序實現求1-1000之間的所有奇數的和并輸出。
???#include <stdio.h>
???main( )
???{ ?int ?i, sum=0;
??????for(i=1; i<1000; i=i+2)
??????????sum=sum+i;
??????printf(“the sum of odd is :%d”,sum);
}
?
18.有一個分數序列:2/1,3/2,5/3,8/5,13/8,21/13……
編程求這個序列的前20項之和。
main()
{
?int i,t,n=20;
??float a=2,b=1,s=0;
for(i=1;i<=n;i++)
{s=s+a/b;
t=a;
a=a+b;
b=t;
}
?printf("sum=%9.6f",s);
}
19. 用數組實現以下功能:輸入5個學生成績,而后求出這些成績的平均值并顯示出來。??
main()
{float ?a[5],i;
float s=0;
for(i=0;i<5;i++)
scanf(“%f”,&a[i]);
for(i=0;i<5;I++)
s=s+a[i];
printf(“result=%f”,s/5);
}
*20、用循環的方法構造一個5行5列的二維數組,使主對角線上的變量為1,其它為0,并將數組中所有項按行按列顯示出來。
main()
{int ?a[5][5],i,j, s=0;
for(i=0;I<5;i++)
for(j=0;j<5;j++)
if(i= =j) a[i][j]=1;
else a[i][j]=0;
for(i=0;i<5;i++)
for(j=0;j<5;j++)
{if(j= =0) ?printf(“\n”);
printf(“%d ?”, a[i][j]);
}
}
21.求一個3×3矩陣對角線元素之和。從鍵盤輸入矩陣元素的值并輸出和的值.
main()
??{ int a[3][3],sum=0;
????int i,j;
????printf("Enter data:\n");
????for(i=0;i<3;i++)
???????for(j=0;j<3;j++)
?????????scanf("%d",&a[i][j]);
?????for(i=0;i<3;i++)
????????sum=sum+a[i][i];
?????printf("sum=%d",sum);
}
22.輸入n的值,n代表行數,輸出如圖所示的圖形。(6分)
?????*
?????* ?* ?*
?????* ?* ?* ?* ?*
?????* ?* ?* ?* ?* ?* ?* ???(此圖為n=4時的輸出結果)
?
#include <stdio.h>
main()
{int ?i , j , k; ?
for (i = 1; i <= 4; i++) ?????????????/*控制行數*/ ??????????
{ for (k = 1; k <= (2 * i - 1); k++) ???/*控制每行輸出的*號個數*/
{ ?printf("*"); }
printf("\n"); ? }} ????????????/*輸出一行后換行*/
23、從鍵盤輸入30名學生的成績數據,求其中的最高分、最低分和平均分。
(提示:用數組存放成績數據)
???#include<stdio.h>
???#define ?M ?30
???main ( )
???{ float score[M], max , min, aver;
?????int ?i ;
?????printf(“please input score: \n”);
?????for(i=0; i<M ; i++)
????????scanf(“%f”, &score[i]);
?????max=score[0];
?????min=score[0];
?????aver=score[0];
?????for(i=1; i<M; i++)
?????{ ?if (max < score[i]) ?max= score[i];
????????if (min>score[i]) ??min=score[i];
????????aver+=score[i];
?????}
?????printf(“max=%f, min=%f,aver=%f”, max, min, aver/M);
}
24.?從鍵盤輸入某班學生某門課的成績及其學號(班級人數最多40人,具體人數由鍵盤輸入),輸出該班最高分和最低分及其學生學號;并輸出該班該課程的總分和平均分。請編寫程序。
#include <stdio.h>
#define ?ARR_SIZE ?40
main()
{ ?float ?score[ARR_SIZE], maxScore,minScore,sum;
int ???n, i;
long ??maxNum, minNum,num[ARR_SIZE];
printf("Please enter total number:");
scanf("%d", &n); ???????????????????
printf("Please enter the number and score:\n");
for (i=0; i<n; i++) ???
?scanf("%ld%f", &num[i], &score[i]);
maxScore = score[0];minScore= score[0];
maxNum = num[0]; minNum= num[0]; ??
??sum=score[0];
for (i=1; i<n; i++) ???????????????????????
{ if (score[i] > maxScore) ?????????????????????
??? { ? maxScore = score[i]; ????????????????????
????? ????maxNum = num[i]; ????????????????
??? }
???????else ?if (score[i] < minScore)
{ ?minScore = score[i]; ????????????????????
????? ???minNum = num[i];
??????????}
????sum=sum+score[i];
}
printf("maxScore = %.0f, maxNum = %ld\n", maxScore, maxNum); ?
??????printf("minScore = %.0f, minNum = %ld\n", minScore, minNum);
printf("sum = %.1f, average = %.1f\n", sum, sum/n);
}
*25.將一個有5個元素的數組中的值(整數)按逆序重新存放。
例: 原來順序為:8、6、5、4、1,要求改為1、4、5、6、8
?define N 5
main()
?{int a[N],I,temp;
??printf(“enter array a:\n”);
??for(I=0;I<N;I++)
???scanf(“%d”,$a[i]);
??for(I=0;I<N;I++)
{ temp=a[i];
?a[i]=a[N-I-1];
?a[N-I-1]=temp;
}
?????????printf(“\n Now, array a:\n”);
?????????for(I=0;I<N;I++)
???????????printf(“%4d”,a[i]);
???????????printf(“\n”);
???????}
?
*26.從鍵盤上輸入一個2*3的矩陣,將其轉置后形成3*2的矩陣輸出。
????main()
???{int a[2][3], b[3][2],i,j;
????for(i=0;i<2;i++)
??????for(j=0;j<3;j++)
???????scanf(“%d”,&a[i][j]);
????for(i=0;i<3;i++)
??????for(j=0;j<2;j++)
?????????b[i][j]=a[j][i];
????for(i=0;i<3;i++)
??????{for(j=0;j<2;j++)
??????????printf("%5d",b[i][j]);
???????printf("\n”);
???????}
????????}
*27.編寫兩個函數分別求兩個整數的最小公倍數和最大公約數,用主函數調用這兩個函數并輸出結果。兩個整數由鍵盤輸入。
???#include "stdio.h"
mingb(x,y)
int x,y;
{int z,i,t;
z=1;
i=1;
if(x>y)
???????{t=x;x=y;y=t;}
while(z<=x*y)
{
?z=i*y;
????????if((z%x==0)&&(z%y==0)) break;
?i++;
}
return(z);
}
maxgy(x,y)
int x,y;
{int z,t;
????if(x>y)
?{t=x;x=y;y=t;}
z=x;
while(z>1)
{ if((x%z==0)&&(y%z==0)) break;
??z--;
}
return(z);
}
main()
{
int a,b,c;
char ch;
printf("\nmingb(1)/maxgy(2)?");
ch=getchar();
printf("\ninput:");
scanf("%d,%d",&a,&b);
if(ch=='1') c=mingb(a,b);
else if(ch='2') c=maxgy(a,b);
printf("the result is %d",c);
getch();
}
*28. 輸入一個3*3矩陣,求出其轉置矩陣,并求出兩個矩陣的和.
main()
{
int a[3][3];
int b[3][3];
int c[3][3]
int i,j;
printf(“please input 6 numbers!”)
for (i=1;i<3;i++)
for(j=1;j<3;j++)
{
scanf(“%d”,&a[i][j]);
b[j][i]=a[i][j];
}
for (i=1;i<3;i++)
for(j=1;j<3;j++)
{
c[i][j]=a[i][j]+b[i][j];
}
for (i=1;i<3;i++)
for(j=1;j<3;j++)
?{
printf(“%d”,a[i][j]);
??}
}
29、從鍵盤輸入10名學生的成績數據,按成績從高到低的順序排列并輸出。(提示:用數組存放成績數據)
main()
{ int a[10];
?int i,j,temp;
?printf("input score:\n");
?for(i=0;i<10;i++)
scanf("%d",&a[i]);
?printf("\n");
for(i=1;i<10;i++)
for(j=0;j<9;j++)
if(a[j]<a[j+1])
{temp=a[j];
?a[j]=a[j+1];
?a[j+1]=temp;
}
for(i=0;i<10;i++)
??????printf("%d,",a[i]);
}
30. 定義一個5行3列的數組,從鍵盤輸入各數組元素的值,計算各數組元素之和。
#include ?<stdio.h>
main( )
{ int i, j ,a[5][3];
printf(“Enter data:\n”);
??for(i=0;i<5;i++)
????for(j=0;j<3;j++)
?????scanf(“%d”,&a[i][j]);
??for(i=0;i<5;i++)
????for(j=0;j<3;j++)
sum=sum+a[i][j];
??printf(“sum=%5d\n”,sum);
}
31、編寫程序,交換兩個數組中的對應元素。
???#include<stdio.h>
???#define N 20
???main( )
???{ ??int a[N], b[N], i, j, temp;
???????printf(“please input a:\n”);
???????for(i=0; i<N; i++)
??????????scanf(“%d”, &a[i]);
???????printf(“please input b:\n”);
???????for(j=0; j<N; j++)
??????????scanf(“%d”, &b[i]);
???????for(i=0; i<N; i++)
???????{ ?temp=a[i];
??????????a[i]=b[i];
??????????b[i]=temp;
????????}
????????for(j=0; j<N; j++)
??????????printf(“%d,”, a[j]);
????????printf(“\n”);
????????for(j=0; j<N; j++)
??????????printf(“%d,”,b[j] );
??????}
*32、從鍵盤上輸入一個4*3的整型數組,找出數組中的最小值及其在數組中的下標。
#include ?<stdio.h>
???main()
{ ?int a[4][3], i , j ,min,m,n;
???printf("Please enter data:");
???for (i=0; i<4; i++)
????????for (j=0; j<3; j++)
???????????scanf(“%d”,& a[i][j]);
??????min=a[0][0];
??????m=0; n=0;
???for (i=0; i<4; i++)
????????for (j=0; j<3; j++)
????????????if (a[i][j]<min)
{min= a[i][j];
?m=i;
?n=j;
}
printf("the min is %d\n, min);
printf("posion is %d ?%d \n, m,n);
}
33.編程實現如下功能:從鍵盤輸入一行字符,統計其中大寫英文字符,小寫英文字符和其他字符的個數。
#include <stdio.h>
#include <string.h>
#define ARR_SIZE 80
main()
{
char str[ARR_SIZE];
int ?len, i, letter = 0, digit = 0, space = 0, others = 0;
????printf("Please input a ?string:");
????gets(str);
????len = strlen(str); ???
for (i=0; i<len; i++)
{ ?if (str[i] >= 'a' && str[i] <= 'z' || str[i] >= 'A' && str[i] <= 'Z') ??
?????????? letter ++; ???????????????/*統計英文字符*/
????????else if (str[i] >= '0' && str[i] <= '9' ) ??
????????????digit ++; ?????????????????/*統計數字字符*/
????????else
others ++; ????????????/*統計其它字符的個數*/
????}
?
printf("English character: ?%d\n", letter);
??? printf("digit character: ?%d\n", digit);
printf("other character: ?%d\n", others);
}
?
*34.編程實現如下功能:
1)在主函數中,實現從鍵盤輸入10名學生某門課的成績,保存在一維數組中;調用排序函數;對排序后的數組中的元素按從高到低打印輸出。
2)編寫排序函數,使用數組名做函數參數,實現對該成績的排序。
#include ?<stdio.h>
#define ARR_SIZE 40
void ?Sort(float score[], long num[], int n); ??
main()
{ ?float ?score[ARR_SIZE];
?? int ???n, i;
?? long ??num[ARR_SIZE];
?? printf("Please enter total number:");
?? scanf("%d", &n); ????????????????????
?? printf("Please enter the number and score:\n");
?? for (i=0; i<n; i++) ?
?? {
??? scanf("%ld%f",&num[i],&score[i]); ?????
}
?? Sort(score, num, n); ????????
?? printf("Sorted results:\n");
?? for (i=0;i<n;i++) ???????????????????
?? { printf("%ld\t%4.0f\n",num[i],score[i]);
}
}
void ?Sort(float score[], long num[], int n) ?
{ ??int ???i, j;
?? float ?temp1; ?
long ??temp2; ?????????????
?? for (i=0; i<n-1; i++) ?????????????????
?? { ? for (j=i+1; j<n; j++) ???????????????
?????? { if (score[j] > score[i]) ??????????????????
?????????? { temp1 = score[j];
?? score[j] = score[i]; ?
score[i] = temp1;
/*交換學號*/
????????? temp2 = num[j]; ??
num[j] = num[i]; ???
num[i] = temp2;
?????????? } ??
} ?
} ?
} ???????????
*35.編程實現如下功能:
實現從鍵盤輸入兩個字符串,分別存入兩個不同的字符數組中;將兩個字符串連接為一個字符串,并打印輸出連接后的整個字符。
#include <stdio.h>
#include <string.h>
#define ARR_SIZE 80
void MyStrcat(char dstStr[], char srcStr[]);
main()
{ ?char ?s[ARR_SIZE], t[ARR_SIZE];
printf("Please enter source string: ");
gets(s);
printf("Please enter destination string: ");
gets(t);
MyStrcat(s,t);
printf("The concatenate string is: ");
puts(s);
}
void MyStrcat(char dstStr[], char srcStr[])
{ ??int i = 0, j;
????while (dstStr[i] != '\0') ? { ??
i++;
????}
????for (j=0; srcStr[j]!='\0'; j++, i++)
????{
???????? dstStr[i] = srcStr[j];
????}
???? dstStr[i] = '\0';
}
?
*36、猜數游戲。系統隨機產生一個整數,通過鍵盤輸入數據猜數,猜對為止,并要求統計猜的次數。
注:rand()函數可以產生0~32767間的正整數,程序中需包含stdlib.h。
#include ?<stdio.h>
???#include ?<stdlib.h>
main()
{
int ?magic; ????????????????
int ?guess; ?????????????????
int ?counter; ???????????????????
magic = rand() % 100 + 1; ??
counter = 0; ???????????
do{
printf("Please guess a magic number:");
scanf("%d", &guess); ??????
counter ++; ??????????????
if (guess > magic) ????
printf("Wrong!Too high!\n");
else if (guess < magic) ?
printf("Wrong!Too low!\n");
}while (guess != magic);
?
printf("Right!\n"); ??????????
printf("counter = %d\n", counter);
}
37.輸入兩個整數,利用指針變量作為函數參數,編程實現兩數互換功能,并將交換后的數據重新輸出。?
#include ?<stdio.h>
void ?Swap(int *x, int *y);
main()
{ int ?a, b;
printf("Please enter a,b:");
scanf("%d,%d", &a, &b);
printf("Before swap: a = %d,b = %d\n", a,b);
Swap(&a, &b);
printf("After swap: a = %d,b = %d\n", a, b); ?
}
void ?Swap(int *x, int *y)
{
int ?temp;
temp = *x;
*x = *y;
*y = temp; ??}
38.隨機輸入若干個學生的體重,以輸入負數或零結束,分別求最重和最輕的體重,并計算平均體重。?
????#include ?<stdio.h>
main()
?{ int n=0;
??float weight,max=0,min=10,sum=0,ave;
??printf(“please input the weight:”);
??scanf(“%f”,& weight);
?while(weight>0)
????{ sum=weight+sum;
?????n++;
?????if (weight<min)
????????min=weight;
?????else if(weight>max)
????????max=weight;
?????scanf(“%f”,& weight);}
if (n>0)
{ ave=sum/n;
printf("maxweight = %f\n " , max); ?
??????printf("minweight = %f\n", min);
printf("ave = %f\n",ave);
???????else ?printf("NO VALID DATA”);
}
39.輸入m,k的值,編程求下面表達式的值:(要求編寫一個求階乘的函數,調用函數實現本題)
#include <stdio.h>
unsigned long Factorial(unsigned int number);
main()
{ unsigned int m, k;
double p;
??printf("Please input m, k:");
??scanf("%u, %u", &m, &k);
??p = (double)Factorial(k) / Factorial (m-k);
??printf("p=%f\n", p);
}
???
unsigned long Factorial(unsigned int number)
{ unsigned long i, result = 1;
????for (i=2; i<=number; i++)
result *= i;
???return result;
}
*40. 編寫程序,其中自定義一函數,用來判斷一個整數是否為素數,主函數輸入一個數,輸出是否為素數。
#include <math.h>
int IsPrimeNumber(int number)
{ int i;
if (number <= 1)
return 0;
for (i=2; i<sqrt(number); i++)
{ if ((number % i) == 0)
return 0; }
return 1;}
?main()
{ int n;
??printf(“Please input n:”);
??scanf(“%d”,&n);
??if(IsPrimeNumber(n))
???printf(“\n%d is a Prime Number”,n);
??else ?printf(“\n%d is not a Prime Number”,n);}
下載:https://download.csdn.net/download/edogawa_konan/10415376
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