for loop in C

for loop in C

• For loop is a loop in which all three statements initialization, condition and increment/decrement is given in a single step (before the code). 
• The for loop in C language is also used to iterate the statement or a part of the program several times
• So code may be executed for 0 or more times.
• It is good if number of iteration(repetition) is known by the user.

The syntax of for loop in c language is given below:

for(initialization;condition;incr/decr)

{  

//code to be executed  

} 

Flowchart of For Loop

• But, we can initialize and increment or decrement the variable also at the time of checking the condition in for loop.

When use for loop in C

• For loop is better if number of iteration is known by the programmer.

---

Example of for loop in C language

• Let's see the simple program of for loop that prints table of 1.

1. #include <stdio.h>      
2. #include <conio.h>      
3. void main(){      
4. int i=0;    
5. clrscr();      
6. for(i=1;i<=10;i++){    
7. printf("%d \n",i);    
8. }      
9. getch();      
10. }      

Output

1243586710

C Program : Print table for the given number using C for loop

1. #include <stdio.h>    
2. #include <conio.h>    
3. void main(){    
4. int i=1,number=0;  
5. clrscr();    
6.   
7. printf("Enter a number: ");  
8. scanf("%d",&number);  
9.   
10. for(i=1;i<=10;i++){    
11. printf("%d \n",(number*i));  
12. }  
13. getch();    
14. }    

Output

Enter a number: 

2

2

4

8

6

12

10

20

14

16

18

Enter a number: 

1000

1000

2000

4000

3000

9000

5000

6000

8000

7000

10000

---

Infinitive for loop in C

• If you don't initialize any variable, check condition and increment or decrement variable in for loop, it is known as infinitive for loop.
• In other words, if you place 2 semicolons in for loop, it is known as infinitive for loop.

1. for(;;)
2. {  
3. printf("infinitive for loop example by https://mskuthar.blogspot.com/");  
4. }  

If you run this program, you will see above statement infinite times.