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C Exercises: Display first 10 natural numbers

1. First 10 Natural Numbers Display

Write a program in C to display the first 10 natural numbers.

This C program demonstrates how to display the first 10 natural numbers. It uses a simple “for” loop to iterate from 1 to 10 and prints each number sequentially to the console. This basic program is an excellent introduction to loops and output in C.

Visual Presentation:

Display first 10 natural numbers


Sample Solution:

C Code:

#include <stdio.h>  // Include the standard input/output header file.

void main() {     
    int i;  // Declare a variable 'i' for the loop counter.
	
    printf("The first 10 natural numbers are:\n");  // Print a message to indicate the output.
	
    for (i=1; i<=10; i++)  // Start a for loop to iterate from 1 to 10.
	{      
		printf("%d ", i);  // Print the current value of 'i'.
	}
	
    printf("\n");  // Print a new line for better formatting.
}

Output:

The first 10 natural numbers are:                                                                               
1 2 3 4 5 6 7 8 9 10

Explanation:

for (i = 1; i <= 10; i++) {
  printf("%d ", i);
}

In the above for loop, the variable i is initialized to 1, and the loop will continue as long as i is less than or equal to 10. In each iteration of the loop, the printf function will print the value of i to the console, followed by a space character.

Finally, the loop will increment the value of i by 1, and the process will repeat until the condition i<=10 is no longer true.

So, when this code runs, it will output the numbers 1 through 10 separated by spaces.

Flowchart:

Flowchart: Display first 10 natural numbers


Step wise execution of C program :

  • Green color means line that has just executed
  • Red color means next line to excute
  • Stack : a stack is an abstract data type that serves as a collection of elements.
Steps Code Stack Output
Step-1 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }

main
i(int): ?

Step-2 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): ?
Step-3 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): ?		 The first 10 natural numbers are:
Step-4 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 1 		The first 10 natural numbers are:
Step-5 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 1 		The first 10 natural numbers are:
1
Step-6 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 2 		The first 5 natural numbers are:
1
Step-7 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 2 		The first 5 natural numbers are:
1 2
Step-8 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 3 		The first 5 natural numbers are:
1 2
Step-9 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 3 		The first 5 natural numbers are:
1 2 3
Step-10 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 4 		The first 10 natural numbers are:
1 2 3
Step-11 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 4 		The first 10 natural numbers are:
1 2 3 4
Step-12 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 5 		The first 10 natural numbers are:
1 2 3 4
Step-13 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 5 		The first 10 natural numbers are:
1 2 3 4 5
Step-14 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 6 		The first 10 natural numbers are:
1 2 3 4 5
Step-15 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 6 		The first 10 natural numbers are:
1 2 3 4 5 6
Step-16 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 7 		The first 10 natural numbers are:
1 2 3 4 5 6
Step-17 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
 main
i(int): 7 		The first 10 natural numbers are:
1 2 3 4 5 6 7
Step-18 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 8 		The first 10 natural numbers are:
1 2 3 4 5 6 7
Step-19 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 8 		The first 10 natural numbers are:
1 2 3 4 5 6 7 8
Step-20 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 9 		The first 10 natural numbers are:
1 2 3 4 5 6 7 8
Step-21 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 9 		The first 10 natural numbers are: 1 2 3 4 5 6 7 8 9
Step-22 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 10 		The first 10 natural numbers are:
1 2 3 4 5 6 7 8 9
Step-23 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 10 		The first 10 natural numbers are:
1 2 3 4 5 6 7 8 9 10
Step-24 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 11		 The first 10 natural numbers are:
1 2 3 4 5 6 7 8 9 10
Step-25 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 11		 The first 10 natural numbers are:
1 2 3 4 5 6 7 8 9 10
Exit 
1 int main(){
2 int i;
3 printf("The first 10 natural numbers are:\n");
4 for (i=1;i<=10;i++)
5 {      
6 printf("%d ",i);
7 }
8 printf("\n");
9 return 0;
10 }
main
i(int): 11		 The first 10 natural numbers are:
1 2 3 4 5 6 7 8 9 10

For more Practice: Solve these Related Problems:

  • Write a C program to display the first 10 natural numbers in reverse order using recursion.
  • Write a C program to display the first 10 natural numbers using pointer arithmetic instead of array indexing.
  • Write a C program to print the first 10 natural numbers without using any loop constructs (use recursion).
  • Write a C program to shuffle the first 10 natural numbers randomly and then display them.

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