To do the C program to find biggest of three numbers we need to get the input three numbers from user. Here we are using if - else condition to check the biggest.

In the first if statement we check a is greater than b if that condition matches a is checked with c. If that condition also gets matched print a as biggest, else print c as biggest.

else check if b greater than c if that condition is true print b as biggest of three. else print c as biggest.

#include <stdio.h> #include <conio.h> #include <math.h> void main() { int a, b, c; clrscr(); printf("Enter the values of a,b and c\n"); scanf ("%d %d %d", &a, &b, &c); printf ("a = %d\tb = %d\tc = %d\n", a,b,c); if ( a > b) { if ( a > c) { printf ("A is the greatest among three\n"); } else { printf ("C is the greatest among three\n"); } } else if (b > c) { printf ("B is the greatest among three\n"); } else printf ("C is the greatest among three\n"); }

==================================================================

**OUTPUT of C program to find the largest of three numbers**

==================================================================

Output

Enter the values of a,b and c

23 32 45

a = 23 b = 32 c = 45

C is the greatest among three

RUN2

Enter the values of a,b and c

234

678

195

a = 234 b = 678 c = 195

B is the greatest among three

RUN3

Enter the values of a,b and c

30 20 10

a = 30 b = 20 c = 10

A is the greatest among three

==================================================================

Output

Enter the values of a,b and c

23 32 45

a = 23 b = 32 c = 45

C is the greatest among three

RUN2

Enter the values of a,b and c

234

678

195

a = 234 b = 678 c = 195

B is the greatest among three

RUN3

Enter the values of a,b and c

30 20 10

a = 30 b = 20 c = 10

A is the greatest among three