Class 10 Computer Science Chapter 4 SEBA : Introduction to Loops – Question Answers

Class 10 Computer Science Chapter 4 SEBA : Introduction to Loops, Class 10 Computer Science Chapter 4 seba question answers, chapter 4 computer science class 10 seba, computer science class 10 chapter 4 seba, Introduction to Loops class 10 seba computer science

In this chapter, we learn about loops in C programming. Loops are used to repeat a group of statements several times. This chapter covers different types of loops such as for loop, while loop and do-while loop, along with their uses in C programs.

Below are the SEBA Class 10 Computer Science Chapter 4 exercise questions and answers, written in simple English for easy understanding and examination preparation.

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SEBA Class 10 Computer Science Chapter 4 – Introduction to Loops : Important Exercise Questions and Answers :

1. Why do we use a loop in a C program?

Answer: We use a loop to repeat the same statements several times. It reduces the length of the program and saves time because we do not have to write the same code again and again.

2. Do we need to use only one type of loop in a C program? Justify your answer with a C program.

Answer: No. We can use different types of loops in the same C program. The three commonly used loops are: while loop, do-while loop for loop.

A program is given below to justify: #include <stdio.h> int main() { int i=0;      while(i<5)       {       printf(“I read in class 10 \n”);       i++;       }      for(i=0; i<5; i++)       {       printf(“I read in class 10 \n”);       } return 0; }

3. What will happen if we write a while with 1 in place of the condition?

Answer: If we write 1 as the condition of a while loop, the condition will always be true. Therefore, the loop will continue to execute and will not stop by itself. Such a loop is called an infinite loop.

Example: 
#include<stdio.h>
int main()
{
 while(1)    
 {
 printf("We must...against corruption \n");    
 }
return 0;
}

//This program will continue running until it is manually stopped. 

4. Name the different parts of a for loop. Can we put more than one statement within a portion?

Answer: The three main parts of a for loop are: 1) Initialization expression 2) Condition checking or testing expression 3) Update expression Yes, we can put more than one statement in a portion of a for loop.

5. Answer with TRUE or FALSE

No.	Statement	Answer
(i)	If the condition of a while loop is false, control comes to the second statement inside the loop.	False
(ii)	We can use at most three loops in a C program.	False
(iii)	The statements inside a do-while loop execute at least once even if the condition is false.	True
(iv)	A for loop is an entry-controlled loop.	True
(v)	In a do-while loop, the condition is written at the end of the loop.	True

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6. Programming Exercises

(A) Write a C program to find the summation of the following series.

(a) 1² + 2² + 3² + … + N²

Answer: 
#include<stdio.h>
int main()
{
 int i, N, sum=0;
 printf("Enter the value of N: ");
 scanf("%d", &N);
 	for(i=1; i<=N; i++) 
 	{
 	   sum=sum + i * i; 
 	}
 printf("Summation is %d", sum);
 return 0;
} 

(b) 1³ + 2³ + 3³ + … + N³

Answer: 
#include<stdio.h>
int main()
{
 int i, N, sum=0;
 printf("Enter the value of N: ");
 scanf("%d", &N);
 	for(i=1; i<=N; i++) 
 	{
 	   sum=sum + i * i * i; 
 	}
 printf("Summation is %d", sum);
 return 0;
} 

(c) 1*2 + 2*3 + 3*4 + … + N*(N + 1)

Answer: 
#include<stdio.h>
int main()
{
 int i, N, sum=0;
 printf("Enter the value of N: ");
 scanf("%d", &N);
 	for(i=1; i<=N; i++) 
 	{
 	   sum = sum + i * (i+1); 
 	}
 printf("Summation is %d", sum);
 return 0;
} 

(B) Write a C program to continuously take a number as input and announce whether the number is odd or even.

Answer: 
#include<stdio.h>
int main()
{
int number, choice=1;
 do
  {
  printf("\n Enter a number: ");
  scanf("%d", &number);
      if(number % 2 == 0)
      printf("Even");
      else
      printf("Odd");
  printf("\n Enter 0 to stop or any number to continue:");
  scanf("%d", &choice);
  } 
  while(choice != 0);
return 0;
}

(C) Write a C program to display the following pattern.

1
11
111
1111
11111

Answer: 
#include<stdio.h>
int main() 
{
int i;
	for(i=1; i<=1; i++) 
	printf("1");
	printf("\n");

	for(i=1; i<=2; i++) 
	printf("1");
	printf("\n");

	for(i=1; i<=3; i++) 
	printf("1");
	printf("\n");

	for(i=1; i<=4; i++) 
	printf("1");
	printf("\n");

	for(i=1; i<=5; i++) 
	printf("1");
	printf("\n");
return 0;
}

(D) Write a C program to display the following pattern.

5
54
543
5432
54321

Answer: 
#include<stdio.h>
int main() 
{
int i;
	for(i=5; i>=5; i--) 
	printf("%d",i);
	printf("\n");

	for(i=5; i>=4; i--) 
	printf("%d",i);
	printf("\n");

	for(i=5; i>=3; i--) 
	printf("%d",i);
	printf("\n");

	for(i=5; i>=2; i--) 
	printf("%d",i);
	printf("\n");

	for(i=5; i>=1; i--) 
	printf("%d",i);
	printf("\n");
return 0;
}

(E) Write a C program to display the following pattern.

54321
5432
543
54
5

Answer: 
#include<stdio.h>
int main() 
{
int i;
	for(i=5; i>=1; i--) 
	printf("%d",i);
	printf("\n");

	for(i=5; i>=2; i--) 
	printf("%d",i);
	printf("\n");

	for(i=5; i>=3; i--) 
	printf("%d",i);
	printf("\n");

	for(i=5; i>=4; i--) 
	printf("%d",i);
	printf("\n");

	for(i=5; i>=5; i--) 
	printf("%d",i);
	printf("\n");
return 0;
} 

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Related Class 10 Computer Science Chapters of SEBA :

→ Chapter 1 SEBA : Introduction to Computer Network
→ Chapter 5 SEBA : Nested loops in C
→ Chapter 6 SEBA : Arrays in C
→ Chapter 7 SEBA : Functions in C

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Important Points to Remember

• A loop is used to repeat statements.
• The three main loops in C are for, while and do-while.
• A for loop is an entry-controlled loop.
• A while loop is also an entry-controlled loop.
• A do-while loop is an exit-controlled loop.
• A do-while loop executes at least once.
• while(1) creates an infinite loop.

Conclusion

The Introduction to Loops chapter is an important part of Class 10 Computer Science because loops are widely used in C programming. Understanding for, while, and do-while loops will help students write shorter and more efficient programs.

These SEBA Class 10 Computer Science Chapter 4 exercise answers are written in simple English to help students understand the concepts and prepare for examinations.

Important things about “Class 10 Chapter 4 : Introduction to Loops : Computer Science SEBA”

In the SEBA Class 10 Computer Science curriculum, Chapter 4: Introduction to Loops covers fundamental repetitive execution techniques in C programming. In standard sequential programming, code runs line by line from top to bottom. However, real-world applications often require executing identical calculations, processing data lists, or printing output patterns multiple times. Writing repetitive statements like printf() over and over increases code length, consumes extra memory, and makes programs harder to maintain. Loop control structures solve this issue by repeating a specific block of code as long as a defined condition remains true, significantly improving code efficiency, readability, and speed.

The SEBA Chapter 4 syllabus details three core loop statements in C:

• The while Loop: Functions as an entry-controlled loop. It evaluates the given condition before running the loop body. If the condition is true, the statements execute; if the condition is false at the start, the loop body is skipped entirely.
• The do-while Loop: Functions as an exit-controlled loop. It checks the condition after executing the loop body. Because evaluation happens at the end, a do-while loop is guaranteed to run at least once, even if the condition is initially false.
• The for Loop: Ideal when the exact number of iterations is known in advance. It combines three vital loop controls into a single line: initialization (setting the loop counter), condition testing (checking when to stop), and the update expression (incrementing or decrementing the counter).

Mastering loop mechanics also involves understanding key concepts such as the loop control variable, termination conditions, and infinite loops. A loop control variable manages the execution state. If this variable is not properly updated or if a condition is permanently set to true (such as while(1)), the program enters an endless infinite loop that runs until forced to stop. Additionally, C provides jump statements like break (which exits the loop immediately) and continue (which skips the remaining code in the current cycle and jumps directly to the next iteration).

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For a step-by-step video breakdown of Chapter 4 concepts, code examples, and exercise solutions, watch this Class 10 CS Chapter 4 Solved Guide. This tutorial directly walks through SEBA Class 10 Chapter 4 C programming questions, loop syntax, and exam-oriented problem-solving.