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文件四则运算
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发布时间:2019-02-28

本文共 1732 字,大约阅读时间需要 5 分钟。

四则运算:随机出十道加减乘除的题目放入文件中,并再另一个文件中解答出来

#define _CRT_SECURE_NO_WARNINGS#include
#include
#include
#include
#include
//四则运算:随机出十道加减乘除的题目放入文件中,并再另一个文件中解答出来//出题void giveQuestion(){ FILE* fp = fopen("test.txt", "w"); if (fp == NULL) { printf("文件打开失败"); return; } // int num1; int num2; char ch; //四则运算符号数组 char symbol[] = "+-*/"; //随机数种子 /*随机数种子写法: srand((unsigned int)time(NULL)); srand((size_t)time(NULL));*/ srand((size_t)time(NULL)); for (int i = 0; i < 10; i++) { //取模 100取模得的余数范围---0~99 num1 = rand() % 100 + 1 ;//范围是0+1~99+1 num2 = rand() % 100 + 1; //范围是0+1~99+1 ch = symbol[rand() % 4]; //范围是0~3 //拼接字符串放入一个新的字符串中 char buf[64] = { 0 }; sprintf(buf, "%d %c %d=\n", num1, ch, num2); //将拼接后的字符串buf放入test.txt中 fputs(buf, fp); } //关闭文件 fclose(fp); printf("十道题目生成成功!\n");}//解题void answerQuestion(){ //先将数据从文件中读取出来 FILE* fp = fopen("test.txt", "r"); if (fp == NULL) { printf("文件打开失败"); } //放入新文件中 FILE* fp1 = fopen("test1.txt", "w"); if (fp1 == NULL) { printf("文件打开失败"); } // int num1; int num2; char ch; int ret=0; //将读取的数据放入一个字符串中 while (!feof(fp)) { char buf[32] = { 0 }; char* result=fgets(buf, sizeof(buf), fp); if (result == NULL) { break; } //将每次循环读取到字符串的题目解出来 //字符串分割函数 sscanf(buf, "%d %c %d", &num1, &ch, &num2); if (ch == '+') ret = num1 + num2; if (ch == '-') //int abs 返回一个整数的绝对值 ret = num1 - num2; if (ch == '*') ret = num1 * num2; if (ch == '/') ret = num1 / num2; //将得出结果的算数式放入文件中 //1.先拼接 char buf1[32] = { 0 }; sprintf(buf1, "%d %c %d=%d\n", num1, ch, num2, ret); fputs(buf1, fp1); } fclose(fp1); fclose(fp); printf("十道题全部解出成功!\n");}int main(){ giveQuestion(); answerQuestion(); return 0;}

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