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
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);
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);
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);