How can I use the "if" function with a "char" value in C?

Question

I would like to do a calculator using a char caracter instead of an integer in an if function.
Something like this:

#include<stdio.h>
int main(){
int a,b;
printf("put the numbers you want to sum");
scanf("%d",&a);
scanf("%d",&b);
char c;
printf("chose an operator");
scanf("%c",&c);
if (c=="+")
printf("%d",a+b);
if (c=="-")
printf(....)
and so on.
The problem is that it doesn't work and i dont't know how to sort this out.
Any suggestion? (i already know that i could do something like if (num==1) printf(...) but i wanted to use a char)

Answer 1

A character is typically enclosed in single quotation marks, i.e. these: ' '.
So try using c == '+' instead for comparison.

Answer 2

I've tried but it doesn't work, it tells me that i've done no mistakes but it doesn't run the if operation

Answer 3

In that case, you probably entered the input like this:
1
1
+
Just for example. Well, the problem is the enter after the second number, which is also a character! So c reads in the enter instead of the '+'. Here you can find a description of the problem aswell as a working solution:
https://gsamaras.wordpress.com/code/caution-when-reading-char-with-scanf-c/