1.

include <stdio.h>
int main()

{

// 初始化

int price = 0;

int bill = 0;

// 读入金额和票面

printf("请输入金额：");

scanf("%d", &price);

printf("请输入票面：");

scanf("%d", &bill);

// 计算找零

printf("应该找您：%d\n", bill - price);

\

return 0;

2.max3.c

#include <stdio.h>

\

int main()

{

int a,b,c;

scanf("%d %d %d", &a, &b, &c);

\

int max = 0;

\

if ( a>b ) {

if ( a>c ) {

max = a;

} else {

max = c;

}

} else {

if ( b>c ) {

max = b;

} else {

max = c;

}

}

\

printf("The max is %d\n", max);

\

return 0;

}