// test.cpp : 定義控制檯應用程式的入口點。

// 在vc2008下除錯透過

#include "stdafx.h"

#include "stdio.h"

#include "stdlib.h"

int main()

{

FILE * myfile;

myfile = fopen("e:\\test.txt","w");

char result[50];

char op;

int i = 0;

while( i++

{

int a = rand() % 10;

int b = rand() % 19; // 生成 0 - 18 b為 0 - 9做加法 10 - 18 做減法

b = 9 - b;

int r = a + b;

if( b > 0)

op = "+";

else

op = "-";

b = abs(b);

sprintf(result,"%d %c %d = %d\n",a,op,b,r);

fputs(result,myfile);

}

fclose(myfile);

return 0;

}

部分結果如下

1 - 9 = -8

4 - 5 = -1

9 - 2 = 7

8 + 6 = 14

2 - 2 = 0

5 + 3 = 8

1 - 3 = -2

1 - 7 = -6

5 - 1 = 4

7 + 7 = 14

1 - 3 = -2

2 + 8 = 10

2 - 4 = -2

不過建議自己多思考，祝你成功