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C Variable Values


Change Variable Values

If you assign a new value to an existing variable, it will overwrite the previous value:

Example

int myNum = 15;  // myNum is 15
myNum = 10;  // Now myNum is 10
Try it Yourself »

You can also assign the value of one variable to another:

Example

int myNum = 15;

int myOtherNum = 23;

// Assign the value of myOtherNum (23) to myNum
myNum = myOtherNum;

// myNum is now 23, instead of 15
printf("%d", myNum);
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Or copy values to empty variables:

Example

// Create a variable and assign the value 15 to it
int myNum = 15;

// Declare a variable without assigning it a value
int myOtherNum;

// Assign the value of myNum to myOtherNum
myOtherNum = myNum;

// myOtherNum now has 15 as a value
printf("%d", myOtherNum);
Try it Yourself »

Add Variables Together

To add a variable to another variable, you can use the + operator:

Example

int x = 5;
int y = 6;
int sum = x + y;
printf("%d", sum);
Try it Yourself »

C Exercises

Test Yourself With Exercises

Exercise:

Display the sum of 5 + 10, using two variables: x and y.

  = ;
int y = 10;
printf("%d", x + y);

Start the Exercise



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