/* C program to find largest number using if...else statement */ 
#include<stdio.h>
int main()
{ 
float a, b, c; 
printf("Enter three numbers: "); 
scanf("%f %f %f", &a, &b, &c); 
if (a>=b) 
{ 
  if(a>=c) 
   printf("Largest number = %.2f",a); 
  else 
   printf("Largest number = %.2f",c); 
} 
else 
{ 
  if(b>=c) 
   printf("Largest number = %.2f",b); 
 else 
   printf("Largest number = %.2f",c); 
} 
return 0; 
}

Output:
Enter three numbers: 
12.2 
13.452 
10.193 
Largest number = 13.45