FloatFahrenheitToCelcius, C (gcc)

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//gcc 5.4.0

/* Program for conversion of celsius to fahrenheit*/

#include  <stdio.h>

int main(void)
{
    float fahr,cel,lower,upper,step; 
    
    /* Declaration for variables such as fahr for fahrenheit, cel for celcius, lower for lower bound of the loop,
    upper for upper bound of the loop and step represents the stepping variable */
    
    lower = 0; //assignment of the lower variable
    
    upper = 300; //assignment of the upper variable
    
    step = 20; //assignment of the step variable 
    
    fahr = lower; //initialize farhenheit variable with starting point
    
    printf("C Program to convert Fahrenheit to Celcius\n\n");
    
    while(fahr <= upper)
    {
       cel = 5.0/9.0 * (fahr - 32.0); //formula for converting farhenheit into celcius
      
       printf("%3.0f\t %6.1f\n",fahr,cel); //printing the values of fahrenheit and celcius  
        
       fahr = fahr + step; //incrementing fahrenheit variable by stepping variable 
      
    }
    
    
    
    return 0; //return on successful execution of the program
}

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Compilation time: 0.14 sec, absolute running time: 0.18 sec, cpu time: 0.07 sec, memory peak: 3 Mb, absolute service time: 0,33 sec