循环程序结构课堂练习题解

A

如果药够, 则拿药, 否则记录

#include <stdio.h>int main()
{int m, n, i;scanf("%d", &m);scanf("%d", &n);int ans = 0;for(i = 1; i <= n; i ++ ){int temp;scanf("%d", &temp);if(m >= temp){m -= temp;}else{ans ++;}}printf("%d\n", ans);
}

B

每次判断三种情况即可

#include <stdio.h>int main()
{long long n, i, c, d, a, b;scanf("%lld", &n);scanf("%lld%lld", &a, &b);for(i = 1; i < n; i ++ ){scanf("%lld%lld", &c, &d);if(20 * (a * d - b * c) > a * c){puts("better");}else if(20 * (b * c - a * d) > a * c){puts("worse");}else{puts("same");}}
}

C

预处理好再输出

#include <stdio.h>int n, i;int a[50];int main()
{scanf("%d", &n);a[1] = 1;a[2] = 1;for(i = 3; i <= 30; i ++ ){a[i] = a[i - 1] + a[i - 2];}for(i = 0; i < n; i ++ ){int temp;scanf("%d", &temp);printf("%d\n", a[temp]);}return 0;
}