C语言程序：
#include
#include
#define MAX 80
void main()
{
char arr[MAX + 1];
char max;
int len;
int i;
printf("Input a string:\n");
gets(arr);
max = '\0';
len = strlen(arr);
for(i=0; i {
if(arr[i] > max)
{
max = arr[i];
}
}
printf("The largest character is \'%c\'.The ASCII is %d.\n", max, max);
}
运行测试：
