C: Variables

#include <stdio.h>


int main(void){
    int i; /* signed integer */
    float f; /* signed floating point numbers */

    i = 2;

    printf("Hello my number is %d", i);

    return 0;
}

All variables must be declared at the beginning of the function before they are used. Declaration means announcing the data type and the name of the variable.

int i, float f means the fahr and celsius variables are of type integer and float.

Using the assignment operator, we have stored something inside the i variable, but to print it out, we need to pass two parameters in the printf function:

1. format string
2. value to print (variable)

char — character: single byte short — short int long — long int double — double-precision float