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What is the difference between = (Assignment) and == (Equal to) operators

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  • Difficulty Level : Easy
  • Last Updated : 30 Nov, 2022
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= operator

The “=” is an assignment operator used to assign the value on the right to the variable on the left. 

For example:

a = 10;
b = 20;
ch = 'y';

Example: 

C




// C program to demonstrate
// working of Assignment operators
 
#include <stdio.h>
 
int main()
{
 
    // Assigning value 10 to a
    // using "=" operator
    int a = 10;
    printf("Value of a is %d\n", a);
 
    return 0;
}


Output:

Value of a is 10

== operator

The ‘==’ operator checks whether the two given operands are equal or not. If so, it returns true. Otherwise it returns false. 

For example:

5==5

This will return true.

Example: 

C




// C program to demonstrate
// working of relational operators
#include <stdio.h>
 
int main()
{
    int a = 10, b = 4;
 
    // equal to
    if (a == b)
        printf("a is equal to b\n");
    else
        printf("a and b are not equal\n");
 
    return 0;
}


Output:

a and b are not equal

The differences can be shown in tabular form as follows:

= ==
It is an assignment operator. It is a relational or comparison operator.
It is used for assigning the value to a variable. It is used for comparing two values. It returns 1 if both the values are equal otherwise returns 0.
Constant term cannot be placed on left hand side. Example: 1=x; is invalid. Constant term can be placed in the left hand side. Example: 1==1 is valid and returns 1.

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