用C语言编写一个小程序 - C语言论坛

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整数的加减法，给孩子用的当然会帮忙，不能亏待祖国的幼苗

，用功课淹没大法来爱您的孩子吧！！！娃哈哈！！！！！～～

程序代码：

#include <stdio.h>
#include <time.h>
#include <stdlib.h>

#define MAX 100

int main(int argc, char **argv)
{
    int x , y , n , i , j , z , k , l ;
    srand(time(NULL));
    printf("输入想要随机的题目数：");
    scanf("%d",&n);
    if ( n >= 0 && n <= MAX){
        printf("输入随机数的范围，例如 -100 100 为-100～100里的随机数，中间有空格隔开: ");
        if ((i = scanf("%d %d",&k,&l)) == 2){
            l = l - k;
            for ( i = 1 ; i <= n ; i++ ){
                x = rand()%l;
                x=x+k;
                y = rand()%l;
                y=y+k;
                j = rand()%2;
                printf("第%d题： (%d) %c (%d) = ",i,x,((j == 0) ? ('+') : ('-')),y);
                scanf("%d",&z);
                if (j == 0){
                    ((x+y) == z) ? (printf("第%d题： 正确\n",i)) : (printf("第%d题： 错误\n",i)) ;
                }
                if (j == 1){
                    ((x-y) == z) ? (printf("第%d题： 正确\n",i)) : (printf("第%d题： 错误\n",i)) ;
                }
            }    
        }
    }
    
    return 0;
}

[此贴子已经被作者于2017-2-25 15:08编辑过]

#include <stdio.h> #include <time.h> int main(void) { FILE *fp; if ((fp = fopen("今日题目.txt", "a")) == NULL) { fprintf(stderr, "创建题目失败\n"); exit(0); } srand((unsigned)time(NULL)); for (int i = 0; i < 10; i++) { if (i % 4 == 0) fprintf(fp, "%d + %d = \t\t%d + %d = \t\t%d + %d = \n", rand(), rand(), rand(), rand(), rand(), rand()); if (i % 4 == 1) fprintf(fp, "%d - %d = \t\t%d - %d = \t\t%d - %d = \n", rand(), rand(), rand(), rand(), rand(), rand()); if (i % 4 == 2) fprintf(fp, "%.2f + %.2f = \t\t%.2f + %.2f = \t\t%.2f + %.2f = \n", rand()*0.7, rand()*0.7, rand()*0.7, rand()*0.7, rand()*0.7, rand()*0.7); if (i % 4 == 3) fprintf(fp, "%.2f - %.2f = \t\t%.2f - %.2f = \t\t%.2f - %.2f = \n", rand()*0.7, rand()*0.7, rand()*0.7, rand()*0.7, rand()*0.7, rand()*0.7); } fclose(fp); return 0; }