Nested Loop in C
Hello Everyone, In this article, we will cover the concept of Nested Loop in C Programming. By understanding how nested loops work and how to use them effectively, you will be able to enhance your C programming skills and tackle more advanced coding challenges with ease. Whether you’re new to C or have some experience, this guide will help you to understand Nested Loop in C effectively. Let’s get started.
In C programming, a nested loop is a loop that is placed inside another loop. This means that the inner loop is executed multiple times for each iteration of the outer loop.
Syntax for a nested loop in C
for (initialization; condition; increment) {
// outer loop statements
for (initialization; condition; increment) {
// inner loop statements
}
}
In this example, the outer loop runs first, and for each iteration of the outer loop, the inner loop runs completely. The inner loop will be executed multiple times, as many times as the outer loop runs.
Nested loops are useful when we need to perform a task that requires multiple iterations, or when we need to perform a specific operation on each element of a two-dimensional array.
However, it’s important to note that using too many nested loops can lead to performance issues and can slow down the program. Therefore, it’s important to use nested loops judiciously and only when necessary.
Nested while loop
In C programming, we can use nested while loops in a similar way to nested for loops. A nested while loop is a while loop that is placed inside another while loop.
Syntax for a Nested while loop in C
while (condition1) {
// outer loop statements
while (condition2) {
// inner loop statements
}
}
In this example, the outer while loop runs first, and for each iteration of the outer while loop, the inner while loop runs completely. The inner while loop will be executed multiple times, as many times as the outer while loop runs.
Nested while loops can be useful when we need to perform a task that requires multiple iterations and we don’t know the exact number of iterations in advance.
Example of nested while loops to find the factorial of a number
#include <stdio.h>
int main() {
int n = 5;
int i = 1;
int factorial = 1;
while (i <= n) {
int j = 1;
while (j <= i) {
factorial *= j;
j++;
}
i++;
}
printf("The factorial of %d is %d", n, factorial);
return 0;
}
In this example, we use nested while loops to calculate the factorial of the number n. We start with an outer while loop that runs n times, and for each iteration of the outer while loop, we start an inner while loop that runs i times. We multiply the variable factorial by j for each iteration of the inner while loop, and then we increment j. After the inner while loop completes, we increment i and continue with the outer while loop.
It’s important to note that like nested for loops, using too many nested while loops can lead to performance issues and can slow down the program. Therefore, it’s important to use nested while loops judiciously and only when necessary.
Nested do while loop
In C programming, a nested do-while loop is a loop that is placed inside another loop. This means that the inner loop is executed multiple times for each iteration of the outer loop.
Syntax for a Nested do-while loop in C
do {
// outer loop statements
do {
// inner loop statements
} while (condition2);
} while (condition1);
In this example, the outer do-while loop runs first, and for each iteration of the outer loop, the inner do-while loop runs completely. The inner do-while loop will be executed multiple times, as many times as the outer do-while loop runs.
Nested do-while loops can be useful when we need to perform a task that requires multiple iterations and we don’t know the exact number of iterations in advance.
Example of Nested do-while loops to print a multiplication table
arduinoCopy code
#include <stdio.h>int main() {
int i = 1;
do {
int j = 1;
do {
printf("%d\\t", i*j);
j++;
} while (j <= 10);
printf("\\n");
i++;
} while (i <= 10);
return 0;
}
In this example, we use nested do-while loops to print a multiplication table from 1 to 10. We start with an outer do-while loop that runs from 1 to 10, and for each iteration of the outer loop, we start an inner do-while loop that runs from 1 to 10. We print the product of i and j for each iteration of the inner loop, and then we increment j. After the inner do-while loop completes, we print a newline character and increment i before continuing with the outer do-while loop.
It’s important to note that using too many nested do-while loops can lead to performance issues and can slow down the program. Therefore, it’s important to use nested do-while loops judiciously and only when necessary.
Nested for loop
In C programming, a nested for loop is a loop that is placed inside another loop. This means that the inner loop is executed multiple times for each iteration of the outer loop.
Syntax for a Nested for loop in C
for (initialization1; condition1; increment1) {
// outer loop statements
for (initialization2; condition2; increment2) {
// inner loop statements
}
}In this example, the outer for loop runs first, and for each iteration of the outer loop, the inner for loop runs completely. The inner for loop will be executed multiple times, as many times as the outer for loop runs.
Nested for loops can be useful when we need to perform a task that requires multiple iterations, or when we need to perform a specific operation on each element of a two-dimensional array.
Example of Nested for loops to print a multiplication table
arduinoCopy code
#include <stdio.h>int main() {
int i, j;
for (i = 1; i <= 10; i++) {
for (j = 1; j <= 10; j++) {
printf("%d\\t", i*j);
}
printf("\\n");
}
return 0;
}In this example, we use nested for loops to print a multiplication table from 1 to 10. We start with an outer for loop that runs from 1 to 10, and for each iteration of the outer loop, we start an inner for loop that also runs from 1 to 10. We print the product of i and j for each iteration of the inner loop, and then we print a newline character and continue with the outer loop.
It’s important to note that using too many nested for loops can lead to performance issues and can slow down the program. Therefore, it’s important to use nested for loops judiciously and only when necessary.
A nested for loop is a loop that is placed inside another loop. This means that the inner loop is executed multiple times for each iteration of the outer loop. We can use nested for loops to perform tasks that require multiple iterations or to perform a specific operation on each element of a two-dimensional array.
Example of Nested for loops to print a pattern of stars
#include <stdio.h>
int main() {
int rows = 5;
int cols = 5;
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
printf("* ");
}
printf("\\n");
}
return 0;
}
In this example, we use nested for loops to print a pattern of stars. The outer for loop runs from 0 to 4, and for each iteration of the outer loop, the inner for loop also runs from 0 to 4. We print a star for each iteration of the inner loop, and then we print a newline character and continue with the outer loop.
The output of this program will be:
* * * * *
* * * * *
* * * * *
* * * * *
* * * * *We can modify this program to print different patterns of stars by changing the conditions of the for loops. For example, we can print a pattern of right triangles using nested for loops:
#include <stdio.h>int main() {
int rows = 5;
for (int i = 0; i < rows; i++) {
for (int j = 0; j <= i; j++) {
printf("* ");
}
printf("\\n");
}
return 0;
}In this example, we use nested for loops to print a pattern of right triangles made of stars. The outer for loop runs from 0 to 4, and for each iteration of the outer loop, the inner for loop runs from 0 to i. We print a star for each iteration of the inner loop, and then we print a newline character and continue with the outer loop.
The output of this program will be:
*
* *
* * *
* * * *
* * * * *