新的lower函数的实现

#include <stdio.h>


char lower(char c, int i);


int main()
{
int a[5] = {0};
int i = 0;
a[++i] = lower('A', i);
printf("%c%c\n", lower('A', i), lower('a', i));
return 0;
}


char lower(char c, int i)
{
int a = i;
return (c >= 'A' && c <= 'Z') ? (c + 'a' - 'A') : (c);
}