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C Loop control statements:
Loop control statements in C are used to perform looping operations until the given condition is true. Control comes out of the loop statements once condition becomes false.
Types of loop control statements in C:
There are 3 types of loop control statements in C language. They are,
- for
- while
- do-while
Syntax for each C loop control statements are given in below table with description.
Loop Name |
Syntax
|
for | for (exp1; exp2; expr3) { statements; }Where, exp1 – variable initialization ( Example: i=0, j=2, k=3 ) exp2 – condition checking ( Example: i>5, j<3, k=3 ) exp3 – increment/decrement ( Example: ++i, j–, ++k ) |
while | while (condition) { statements; }where, condition might be a>5, i<10 |
do while | do { statements; } while (condition);where, condition might be a>5, i<10 |
1. malloc()
Example program (for loop) in C:
In for loop control statement, loop is executed until condition becomes false.
1 2 3 4 5 6 7 8 9 10 11 12 |
#include <stdio.h> int main() { int i; for(i=0;i<10;i++) { printf("%d ",i); } } |
Output:
0 1 2 3 4 5 6 7 8 9
|
Example program (while loop) in C:
In while loop control statement, loop is executed until condition becomes false.
1 2 3 4 5 6 7 8 9 10 11 12 13 |
#include <stdio.h> int main() { int i=3; while(i<10) { printf("%d\n",i); i++; } } |
Output:
3 4 5 6 7 8 9
|
Example program (do while loop) in C:
In do..while loop control statement, while loop is executed irrespective of the condition for first time. Then 2nd time onwards, loop is executed until condition becomes false.
1 2 3 4 5 6 7 8 9 10 11 12 13 |
#include <stdio.h> int main() { int i=1; do { printf("Value of i is %d\n",i); i++; }while(i<=4 && i>=2); } |
Output:
Value of i is 1
Value of i is 2 Value of i is 3 Value of i is 4 |
Difference between while & do while loops in C language:
while | do while |
Loop is executed only when condition is true.
|
Loop is executed for first time irrespective of the condition. After executing while loop for first time, then condition is checked. |