PYQ - 2 | C Programming Previous Year Questions (PYQ) PDF | MCQs & Solutions| Comprehensive C Programming Quiz with Detailed Explanations

PYQ - 2 | C Programming Previous Year Questions (PYQ) PDF | MCQs & Solutions| Comprehensive C Programming Quiz with Detailed Explanations

• 2.
  Q.1. What isthe output of the following code? printf("%.2f", 3.14159); A. 3 B. 3.14 ✅ C. 3.142 D. None ❖ The %.2f format specifier treats your value as a floating-point number and restricts the output to exactly two digits after the decimal point. Because the third decimal digit of 3.14159 is 1 (which is less than 5), the number rounds down, resulting in 3.14. ★ Computer Science- 2023
• 3.
  Q.2. How doyou write a single-line comment in C ? A. /* This is a comment */ B. # This is Comments C. // This is Comments D. – – This is Comments ❖ To write a single-line comment in C,utilizing two forward slashes (//) serves as the standard syntax for creating a single-line comment. ★ ISRO - 2015
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  Q.3. Which storageclass provides the shortest access time? A. Auto B. Extern C. Static D. Register✅ ❖ Register memory provides the shortest access time. ❖ Located directly within the CPU, registers are built to hold the exact data and instructions the processor is immediately using. ❖ Because they don't have to communicate with the rest of the computer's components, access times are nearly instantaneous (often within a single clock cycle). ★ Computer Science - 2024
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  Q.4. Which ofthe following correctly declares an array ? A. Int Weeks[20];✅ B. Int Weeks; C. Int Weeks{20}; D. Array Weeks[20]; ❖ Languages like C or C++, a standard array declaration generally follows the syntax: data_type array_name[array_size]; ❖ for example, int myArray[10]; ★ ISRO - 2008
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  Q.5. What willbe the output of the following C code? printf("%d", strlen("hello")); A. 4 B. 5✅ C. 6 D. 7 ❖ String Length: The strlen() function counts the number of characters in a string up to, but not including, the null-terminating character (0). ❖ Character Count: The string "hello" contains exactly 5 characters: h, e, l, l, and o. ❖ Printing: The printf function uses the %d format specifier to display this length as an integer value. ★ Computer Science - 2025
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  Q.6. _______ referto the names of functions, variables, arrays, classes etc. A. Identifiers ✅ B. Manipulators C. Operators D. Punctuators The names given to program elements like variables, functions, arrays, and classes are called identifiers. Rules for Creating Identifiers ● Character sets: They must consist only of letters, digits, and underscores (_). ● Starting character: They must begin with a letter or an underscore, never a number. ● No spaces: White spaces or special characters are strictly prohibited within the name. ● Keywords: Reserved language keywords (like int, if, or class) cannot be used as identifiers. ★ CDAC CCAT - 2017
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  Q.7. What isthe default storage class for a global variable ? A. Auto B. Extern ✅ C. Static D. Register ❖ The default storage class for a global variable is extern (external). Variables declared globally have a static duration and are allocated in the data segment of memory. By default, they are visible to all files in the program and automatically initialized to 0. ❖ If a global variable is declared but not defined, C treats it as an `extern` variable by default. `extern` variables are accessible throughout the entire program, making them global in nature. ★ Computer Science - 2023
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  Q.8. Size ofa union is determined by the size of the _____ ? A. First Member of the Union B. Last Member of the Union C. Biggest Member of the Union ✅ D. All Of These ❖ The size of a union is determined by the size of its largest member. ❖ Because all members in a union share the exact same memory space, the compiler allocates enough memory to accommodate the largest data type, plus any necessary padding for byte alignment ★ TCS - 2026
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  Q.9. What isthe purpose of the '%s' format specifier in C ? A. To Print the single character B. To print an Integer C. To print a String ✅ D. To print the floating point number ❖ In C, the %s format specifier is used as a placeholder to read or print a string (a sequence of characters). ❖ It functions by interacting with a pointer to the first character of a null-terminated (0) character array ★ Computer Science - 2023
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  Q.10. The valueobtained in the function is given back to main by using __________ keyword. ? A.Static B. New C. Non- Volatile D. Return ✅ ❖ In programming, the return keyword is used to send a value back from a function to the calling code (like main). ❖ It terminates the function execution and passes control along with any specified value. ★ UP LT - 2026