C | Data Types | Question 3

Predict the output

#include <stdio.h>

int main()
{
   float c = 5.0;
   printf ("Temperature in Fahrenheit is %.2f", (9/5)*c + 32);
   return 0;
}

(A) Temperature in Fahrenheit is 41.00
(B) Temperature in Fahrenheit is 37.00
(C) Temperature in Fahrenheit is 0.00
(D) Compiler Error


Answer: (B)

Explanation: Since 9 and 5 are integers, integer arithmetic happens in subexpression (9/5) and we get 1 as its value.

To fix the above program, we can use 9.0 instead of 9 or 5.0 instead of 5 so that floating point arithmetic happens.

#include <stdio.h>

int main()
{
   float c = 5.0;
   printf ("Temperature in Fahrenheit is %.2f", (9.0/5)*c + 32);
   return 0;
}

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