CODEWITHSUNDEEP
c
Debarati Banerjee
Debarati Banerjee

Reputation: 33

why it does not print the value of fahrenheight and equivalent celsius in reverse order from 300 to -40?

#include<stdio.h>

main()
{
    int fahr;
    for(fahr = 300; fahr >= -40; fahr = fahr - 20)
        printf("%3.d %8.d\n ",fahr,(5.0/9.0) * (fahr - 32.0));
}

It prints the equivalent values but all wrong. Why is it happening?

Upvotes: 3

Views: 70

Answers (2)

dbush
dbush

Reputation: 224457

The expression that converts to Celsius uses constants of type double so the expression is of type double. Because you're using the %d format specifier with a double value, you get undefined behavior.

Change the second format specifier to %8.f and you'll get the expected output. Also, change the first format specifier to %3.1d so that when fahr is 0 it will print the value instead of just blanks.

printf("%3.1d %8.f\n ",fahr,(5.0/9.0) * (fahr - 32.0));

Upvotes: 3

Md. Shohan Hossain
Md. Shohan Hossain

Reputation: 118

Because you trying to use double, where you need to use float. Try this:

#include<stdio.h>
main()
{
int fahr;
for(fahr = 300; fahr >= -40; fahr = fahr - 20)
    printf("%3.d %8.f\n ",fahr,((fahr - 32) * .5556));
}

Upvotes: 1

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