C语言。编程实现简单的四则运算。比如输入3+5=8，输入3*5=15。要有算法分析图和完整的源代码

#include

int main()

{int a,b,c;

char op;

scanf("%d%c%d",&a,&op,&b);

while(op!='+'&&op!='-'&&op!='*'&&op!='/')

{printf("只能计算加减乘除，请重新输入：\n");

scanf("%d%c%d",&a,&op,&b);

}

if(op=='/'&&b==0)

{printf("divided by zero.\n");

return (1);

}

switch(op)

{case '+':c=a+b;break;

case '-':c=a-b;break;

case '*':c=a*b;break;

case '/':c=a/b;break;

}

printf("%d%c%d=%d\n",a,op,b,c);

return 0;

}