c语言简单程序编写？

C语言编写一个简单程序~

#include #include void main(){int a,b,c;char str[4]={'+','-','*','/'};double d,num;srand(time(NULL));a=rand()%90+10;b=rand()%10+1;c=rand()%4;switch(str[c]){case '+':d=a+b;break;case '-':d=a-b;break;case '*':d=a*b;break;case '/':d=a*1.0/b;break;}printf("%d%c%d=",a,str[c],b);scanf("%lf",&num);if(num==d) printf("Right!");else(c!=3)?printf("Wrong!
%d%c%d=%d",a,str[c],b,(int)d):printf("Wrong!
%d%c%d=%lf",a,str[c],b,d);}

以下为程序代码及执行结果： #include #include int main() { printf("hello world!
"); system("pause"); return 0; } 执行结果：

#include<stdio.h>

int main()

{

    double num1, num2, result, re;

    char sign, euq;

    printf("Enter an expression: ");

    while(scanf("%lf%c%lf%c%lf", &num1,&sign,&num2,&euq,&result) == 5)

    {

        switch(sign)

        {

            case '+':

                re = num1 + num2;

                break;

            case '-':

                re = num1 - num2;

                break;

            case '*':

                re = num1 * num2;

                break;

            case '/':

            if(num2 != 0)

                re = num1 / num2;

            break;

        }

        if( re == result)

            printf("Perfect.
");

        else 

            printf("Error
");

        printf("Enter an expression: ");

    }

    return 0;

}

#include<stdio.h>
int main()
{
float x, y, z;
char c, d;
scanf("%f%c%f%c%f", &x, &c, &y, &d, &z);
switch(c)
{
case '+':
if ((x + y) == z)
printf("perfect\n");
else
printf("error\n");
break;
case '-':
if ((x - y) == z)
printf("perfect\n");
else
printf("error\n");
}

return 0;
}

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c语言简单程序编写？视频