What is wrong with this program? From Celsius to Fahrenheit [closed] - c

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#include <stdio.h>
main() {
int i;
printf("Celsius Fahr\n");
for(i=0; i<20; i++)
printf("%7d %4.2f\n", i, convert(i));
return 0;
}
int convert(int a) {
float b;
b=(1.8*a)+32;
return b;
}
It gives me as output all the Fahrenheit numbers as zero. What did I do wrong?

Answer 1

Change main() to int main().
Change int convert(int a) to float convert(int a).
Add a function prototype float convert(int); before int main().
Use proper indentation.
Modified code :-
#include <stdio.h>
float convert(int); // Funtion prototype
int main()
{
int i;
printf("Celsius Fahr\n");
for (i = 0; i < 20; i++)
printf("%7d %4.2f\n", i, convert(i));
return 0;
}
float convert(int a)
{
float b;
b = (1.8 * a) + 32;
return b;
}
Output :-
Celsius Fahr
0 32.00
1 33.80
2 35.60
3 37.40
4 39.20
5 41.00
6 42.80
7 44.60
8 46.40
9 48.20
10 50.00
11 51.80
12 53.60
13 55.40
14 57.20
15 59.00
16 60.80
17 62.60
18 64.40
19 66.20