c语言程序设计10以内加减法

#include#include#includemain(){inti,n,fen=0,pinta,b,numprintf("请输入题目数目：")scanf("%d",&n)srand(time(0))for(i=0i=(0.8*n)){if(fen==n)printf("棒极了!\n")}elseprintf("请保持!\n")}

// test.cpp : 定义控制台应用程序的入口点。

// 在vc2008下调试通过

#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++<100)

{

int a = rand() % 10

int b = rand() % 19// 生成 0 - 18 b为 0 - 9做加法 10 - 18 做减法

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

}

部分结果如下

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

不过建议自己多思考，祝你成功

---