【C语言】10以内乘加乘减法和100以内加减法运算

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【C语言】10以内乘加乘减法和100以内加减法运算

在给小学生出题时，想到写个代码解决，每天10道题。

仅给出了题目哦。

#include<stdio.h>
#include<stdlib.h>         //srand,rand函数 
#include<time.h>        //time函数 int i;int main()
{srand((unsigned int)time(NULL));for(i=0;i<10;i++){            //10以内乘加乘减法运算int ret1 = rand()%9+1;int ret2 = rand()%9+1;int ret3 = rand()%9+1;int ret4 = rand()%2+1;switch(ret4){case 1: printf("%d ×%d + %d =  \n",ret1,ret2,ret3);case 2: printf("%d ×%d - %d =  \n",ret1,ret2,ret3);}}for(i=0;i<10;i++){            //100以内加减法运算int ret6 = rand()%100+1;int ret5 = rand()%100+1;int ret7 = rand()%2+1;if(ret7 == 1){if(ret5+ret6>=100){if(ret5>ret6){printf("%2d - %2d =  \n",ret5,ret6);}else{printf("%2d - %2d =  \n",ret6,ret5);}}else{printf("%2d + %2d =  \n",ret6,ret5);}}else {if(ret5>ret6){printf("%2d - %2d =  \n",ret5,ret6);}else{printf("%2d - %2d =  \n",ret6,ret5);}}                    }return 0; 
}

有更简便的或错误，欢迎指出，谢谢！！