2014 全志科技校園招聘筆試題-------編程：

題目：給定字符串''just do it !'',將其轉(zhuǎn)化為大寫"JUST DO IT!"

方法一：

/*

*

*?? ?給定一組字符串"just do it!"，將其變成全部大寫"JUST DO IT!"

*?? ?方法一：判斷字符串范圍，對 >=‘a(chǎn)’ &&? <='z' 的字符串進行轉(zhuǎn)換，即 += 'A'-'a'

*/

#include

#include

#define STR_CHANGE 'A'-'a'

void main()

{

int i=0;

int str_length=0;

/*

*?? ?使用字符數(shù)組的方法保存字符串，如果使用字符指針的形式(如下)，程序會出錯

*?? ?因為，char *string形式的字符串是只讀的，不允許對字符串的字符進行修改

*?? ?(只能修改指針變量str的值，使其指向其它字符串)

*?? ?char *str="just do it!";

*/

char str[20]="just do it!";

printf("before:%s\n",str);

str_length=strlen(str);

for(i=0;i

{

printf("before: ASCII is %3ld char is %c ",str[i],str[i]); //為了突出比較結(jié)果轉(zhuǎn)換前打印出ASCII碼值和對應(yīng)字符

if(str[i] >= 'a' && str[i] <= 'z')

{

str[i] += STR_CHANGE;

}

printf("\tafter:? ASCII is %3ld char is %c\n",str[i],str[i]); //為了突出比較結(jié)果轉(zhuǎn)換后打印出ASCII碼值和對應(yīng)字符

}

printf("after:%s\n",str);

}

方法二：

/*

*

*給定一組字符串"just do it!"，將其變成全部大寫"JUST DO IT!"

*方法二：使用函數(shù)toupper 引用頭文件 ctype.h

*/

#include

#include

#include

void main()

{

int i=0;

int str_length=0;

char str[20]="just do it!";

printf("before:%s\n",str);

str_length=strlen(str);

for(i=0;i

{

printf("before: ASCII is %3ld char is %c ",str[i],str[i]); //為了突出比較結(jié)果轉(zhuǎn)換前打印出ASCII碼值和對應(yīng)字符

if(str[i] >= 'a' && str[i] <= 'z')

{

str[i] = toupper(str[i]);

}

printf("\tafter: ASCII is %3ld char is %c\n",str[i],str[i]); //為了突出比較結(jié)果轉(zhuǎn)換后打印出ASCII碼值和對應(yīng)字符

}

printf("after:%s\n",str);

}

/*

*附錄：

*ctype.h 中 toupper()函數(shù)具體方法

*int toupper(int char)

*{

*return char+'A'-'a';

* }

*

*

*ctype.h 中 tolower()函數(shù)具體方法

*int tolower(int char)

*{

*return char+'a'-'A';

* }

*/

運行結(jié)果：

before:just do it!

before: ASCII is 106 char is j after: ASCII is 74 char is J

before: ASCII is 117 char is u after: ASCII is 85 char is U

before: ASCII is 115 char is s after: ASCII is 83 char is S

before: ASCII is 116 char is t after: ASCII is 84 char is T

before: ASCII is 32 char is after: ASCII is 32 char is

before: ASCII is 100 char is d after: ASCII is 68 char is D

before: ASCII is 111 char is o after: ASCII is 79 char is O

before: ASCII is 32 char is after: ASCII is 32 char is

before: ASCII is 105 char is i after: ASCII is 73 char is I

before: ASCII is 116 char is t after: ASCII is 84 char is T

before: ASCII is 33 char is ! after: ASCII is 33 char is !

after:JUST DO IT!

方法三：

使用strupr函數(shù)

原型：extern char *strupr(char *s);

用法：#include

功能：將字符串s轉(zhuǎn)換為大寫形式

說明：只轉(zhuǎn)換s中出現(xiàn)的小寫字母，不改變其它

字符。返回指向s的

指針。

兼容性說明：

strupr不是標(biāo)準(zhǔn)C庫函數(shù)，只能在VC中使用。在linux gcc環(huán)境下需要自行定義這個函數(shù)。

/*

*

*給定一組字符串"just do it!"，將其變成全部大寫"JUST DO IT!"

*方法三：使用函數(shù)strupr 引用頭文件 string.h

*/

#include

#include

#include

void main()

{

char str[20]="just do it!";

printf("before:%s\n",str);

printf("change to upper :%s\n",strupr(str));

printf("change to lower :%s\n",strlwr(str));

printf("after:%s\n",str);

}

總結(jié)

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