#includevoid main() {double a,b; char op; scanf("%lf%c%lf",&a,&op,&b); if(op=='+')printf("%f+%f=%f",a,b,a+b); if(op=='-')printf("%f-%f=%f",a,b,a-b); if(op=='*')printf("%f*%f=%f",a,b,a*b); if(op=='/')printf("%f/%f=%f",a,b,a/b);} #includevoid main() {double a,b; char op; scanf("%lf%c%lf",&a,&op,&b); switch(op) { case '+':printf("%f+%f=%f",a,b,a+b);break; case '-':printf("%f-%f=%f",a,b,a-b);break; case '*':printf("%f*%f=%f",a,b,a*b);break; case '/':printf("%f/%f=%f",a,b,a/b);break; default:printf("\n输入有误!");break; } }
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