![](http://images0.cnblogs.com/blog/571388/201310/02220850-23068f44205948d6b10c55331935725d.jpg)
#include<stdio.h> int main(void) { double value1,value2; char op; printf("Type in an expression:"); scanf("%lf%c%lf",&value1,&op,&value2); if(op=='+') printf("=%.2f ",value1+value2); else if(op=='-') printf("=%.2f ",value1-value2); else if(op=='*') printf("=%.2f ",value1*value2); else if(op=='/') printf("=%.2f ",value1/value2); else printf("Unknown operator "); return 0; }