if-else :

if-else statement is used to execute a statement block or a single statement depending on the value of a condition.

Example 1 :

/* Description: program to find biggest of two numbers */ #include<stdio.h> #include<conio.h> main() { int a,b,big; //clrscr(); printf("\n Enter two numbers:\n"); scanf("%d %d",&a,&b); big=a; if(b>big) big=b; printf("\n Biggest number is %d",big); getch(); }

Note : clrscr() It is predefined function in "conio.h" (console input output header file), by using this function we can clear the data from consol(Monitor), Here we skip this function( just remove // to you can use this function ).
getch() is a way to get a user inputted character (getch() andgetchar() are used to read a character from screen). It can be used to hold program execution.

Output 1 :

Example 2 :

/* Description: simple if-else example */ #include<stdio.h> main() { int a; printf("\n Enter only number 1\n"); scanf("%d",&a); if(a==1) { printf("You enter right number."); } else { printf("You press wrong number."); } getch(); }

Output 2 :