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C if else Statement

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C if else Statement

The if statement in C language is used to perform operation on the basis of condition. By using if-else statement, you can perform operation either condition is true or false.

There are many ways to use if statement in C language:

  • If statement
  • If-else statement
  • If else-if ladder
  • Nested if

If Statement

The single if statement in C language is used to execute the code if condition is true. The syntax of if statement is given below:

 
  1. if(expression){  
  2. //code to be executed  

 

Flowchart of if statement in C

 c if statement

Let's see a simple example of c language if statement.

 
  1. #include<stdio.h>  
  2. #include<conio.h>  
  3. void main(){  
  4. int number=0;  
  5. clrscr();  
  6.   
  7. printf("enter a number:");  
  8. scanf("%d",&number);  
  9.   
  10. if(number%2==0){  
  11. printf("%d is even number",number);  
  12. }  
  13.   
  14. getch();  
  15. }  

Output

enter a number:4
4 is even number

enter a number:5

If-else Statement

The if-else statement in C language is used to execute the code if condition is true or false. The syntax of if-else statement is given below:

 
  1. if(expression){  
  2. //code to be executed if condition is true  
  3. }else{  
  4. //code to be executed if condition is false  
  5. }  

Flowchart of if-else statement in C

 if else estatement

Let's see the simple example of even and odd number using if-else statement in C language.

 
  1. #include<stdio.h>  
  2. #include<conio.h>  
  3. void main(){  
  4. int number=0;  
  5. clrscr();  
  6.   
  7. printf("enter a number:");  
  8. scanf("%d",&number);  
  9.   
  10. if(number%2==0){  
  11. printf("%d is even number",number);  
  12. }  
  13. else{  
  14. printf("%d is odd number",number);  
  15. }  
  16. getch();  
  17. }  

Output

enter a number:4
4 is even number

enter a number:5
5 is odd number

If else-if ladder Statement

The if else-if statement is used to execute one code from multiple conditions. The syntax of if else-if statement is given below:

 
  1. if(condition1){  
  2. //code to be executed if condition1 is true  
  3. }else if(condition2){  
  4. //code to be executed if condition2 is true  
  5. }  
  6. else if(condition3){  
  7. //code to be executed if condition3 is true  
  8. }  
  9. ...  
  10. else{  
  11. //code to be executed if all the conditions are false  
  12. }  

Flowchart of else-if ladder statement in C

c statement

The example of if-else-if statement in C language is given below.

 
  1. #include<stdio.h>  
  2. #include<conio.h>  
  3. void main(){  
  4. int number=0;  
  5. clrscr();  
  6.   
  7. printf("enter a number:");  
  8. scanf("%d",&number);  
  9.   
  10. if(number==10){  
  11. printf("number is equals to 10");  
  12. }  
  13. else if(number==50){  
  14. printf("number is equal to 50");  
  15. }  
  16. else if(number==100){  
  17. printf("number is equal to 100");  
  18. }  
  19. else{  
  20. printf("number is not equal to 10, 50 or 100");  
  21. }  
  22. getch();  
  23. }  

Output

enter a number:4
number is not equal to 10, 50 or 100

enter a number:50
number is equal to 50
 
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