Paper Code: MATSEC-151T
Semester: 2nd Semester (FYUG)
Full Marks: 50
Time Duration: 2 Hours
SECTION-A (1 Mark Each)
Answer any fifteen questions. All questions solved below.
Question 1
1What is the C character set?
The C character set includes upper and lowercase alphabets (A-Z, a-z), digits (0-9), and special characters like +, -, *, /, %, &, and punctuation marks.
Question 2
1What are keywords in C?
Keywords are reserved words in C that have a predefined meaning to the compiler and cannot be used as identifiers.
Question 3
1Name three classes of data types in C.
The three classes are Primary (Built-in), Derived, and User-defined data types.
Question 4
1Write the general format of scanf function.
scanf("control_string", &variable1, &variable2, ...);
Question 5
1What are logical operators in C?
Logical operators include AND (&&), OR (||), and NOT (!).
Question 6
1Value of: 5+5 == 10 && 2+3 > 5?
(5+5 == 10) is True (1); (2+3 > 5) is False (0). Since 1 && 0 is 0, the value is False.
Question 7
1Write the C expression for sqrt(b² - 4ac) > 0.
sqrt(b * b - 4 * a * c) > 0
Question 10
1Write the general syntax of simple IF statement.
if (expression) { statement; }Question 11
1What is an exit-controlled loop?
A loop where the test condition is evaluated at the end of the loop body (e.g., do-while loop).
Question 15
1What are void functions?
Functions that do not return any value to the calling function.
Question 19
1What is the first subscript of an array in C?
The first subscript (index) is always 0.
SECTION-B (2 Marks Each)
Answer any five questions.
Question 21
2Rules for naming identifiers in C.
Question 23
2Difference between ++i and i++.
++i (Prefix) increments the value first and then uses it in the expression.
i++ (Postfix) uses the current value in the expression first and then increments it.Question 25
2C program to check whether a number is odd or even.
#include <stdio.h>
int main() {
int n;
scanf("%d", &n);
if (n % 2 == 0) printf("Even");
else printf("Odd");
return 0;
}
SECTION-C (5 Marks Each)
Answer any five questions.[span_42](end_span)
Question 35
3+2=5(a) Sum of first n natural numbers using while loop.
#include <stdio.h>
int main() {
int n, i = 1, sum = 0;
scanf("%d", &n);
while (i <= n) {
sum += i;
i++;
}
printf("%d", sum);
return 0;
}
(b) Difference between exit-controlled and entry-controlled loop.[span_44](end_span)
In an entry-controlled loop (for, while), the condition is checked before entering the loop.
In an exit-controlled loop (do-while), the body is executed at least once before checking the condition.Question 36
3+2=5(a) Explain switch statement with example.
The switch statement allows a variable to be tested for equality against a list of values (cases).
switch(choice) {
case 1: printf("One"); break;
default: printf("Other");
}
(b) Difference between break and continue.[span_49](end_span)
Break terminates the loop or switch entirely.
Continue skips the current iteration and jumps to the next iteration of the loop.Question 37
3+2=5C program for Factorial using Recursion.
int fact(int n) {
if (n == 0) return 1;
return n * fact(n - 1);
}
Centigrade to Fahrenheit/Kelvin.[span_53](end_span)
F = (C * 9/5) + 32; K = C + 273.15.
Question 39
5Program to find sum of array elements.
#include <stdio.h>
int main() {
int a[10], n, sum = 0;
scanf("%d", &n);
for(int i=0; i<n; i++) {
scanf("%d", &a[i]);
sum += a[i];
}
printf("Sum = %d", sum);
return 0;
}
Exam Focus Enhancements
#include <stdio.h> and return 0; in your code snippets to avoid losing marks.[span_56](end_span)[span_57](end_span)= instead of == for comparison in if statements.data_type array_name[size];return_type name(arguments);Prepared by Knowlet