How to define variables in c programming

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#include <stdio.h>

int main(void){
// defining variables, computing their sum and printing sum on the screen

int number1; //defined variable named as number1 with data type integer
int number2; // defined variable named as number2 with data type integer
int sum; // defined variable named as sum with data type integer

number1 = 5; // assigned value to variable named as number1
number2 = 20; // assigned value to variable named as number2
sum = number1 + number2; // assigned value to variable named as sum

printf("Sum = %d", sum); // printing the value stored in variable named as sum. %d will hold the value of variable named as sum.
//Furthermore %d tells the compiler that the value of variable sum should be of the data type decimal integer

return 0;
}
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