P122,6

#include<stdio.h>  
#include<ctype.h>  
char up(char ch)  
{  
    ch=toupper(ch);  
    return ch;  
}   
int main()  
{  
    char ch;  
    printf("输入一个字符：");  
    scanf("%c",&ch);  
    printf("%c\n",up(ch));  
    return 0;  
}