err, you need to use code tags, learn c and use brackets:
Code:
#include <stdio.h>
int main() {
float fahrenheit, celsius;
int a;
printf("Enter a value of 1 for Celsius, 2 for Fahrenheit:\n");
scanf("%d", &a);
if (a == 1) {
printf("Enter a degrees in Celcius:\n");
scanf("%f",& celsius);
fahrenheit = 1.8*celsius + 32.0;
printf("Fahrenheit = %f\n", fahrenheit);
} else {
printf("Enter a degrees in Fahrenheit:\n");
scanf("%f", & fahrenheit);
celsius = (fahrenheit - 32) * 5 / 9;
printf("Celsius = %f\n", celsius);
}
return 0;
}