AMU MCA Computer Previous Year Questions (PYQs) – Page 10 of 14
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Showing 137 questions
What is the name of storage device which is used to compensate for the difference in rates of flow of data from one device to another?
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Solution
A buffer temporarily stores data to handle speed mismatch between devices.
What does ‘BREAK’ keyword do in C programming language?
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Solution
break immediately terminates the loop or switch statement.
What will be the output of the following program?
int main()
{
int *p, a = 12;
p = &a;
*p += 1;
printf("12,");
--*p;
printf("%d, %d\n", *p, a);
return 0;
}
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Solution
a=12 → *p+=1 makes a=13.
Then --*p makes a=12.
Printed output becomes 12,12,12.
Consider the array definition
int num[10] = {3, 3, 3};
Pick the correct answer:
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Solution
Array size is 10, so valid indices are 0 to 9.
Hence num[9] is the last element.
Uninitialized elements are set to 0.
You want to check whether a given set of items is sorted or not. Which sorting method will be most efficient if it is already sorted?
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Solution
Insertion sort runs in O(n) for already sorted data.
The time required for a pulse to change from 10 to 90 percent of its maximum value is called:
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Solution
Rise time is defined as the time taken for a signal to rise from 10% to 90% of its maximum value.
What is the value of $X$ in the following equation?
$(21043)8 + (765){16} = (X)_2$
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Solution
$(21043)8 = 8739{10}$
$(765){16} = 1893{10}$
Sum $=10632_{10}$
$(10632)_{10} = (1011101001011)_2$
What is output for the program given below?
#include <stdio.h>
void main()
{
int i = 500, j = 1000, k;
k = (i > 500 && j == 1000);
printf("k = %d", k);
}
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Solution
Rise time is defined as the time taken for a signal to rise from 10% to 90% of its maximum value.
Who invented cut / copy & paste?
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Solution
Cut, copy and paste were invented by Larry Tesler at Xerox PARC.
What is output for the program given below?
#include <stdio.h>
void main()
{
int i = 7;
for (; i < 12; i++);
printf("%d", i);
}
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Solution
The semicolon after for makes it an empty loop.
Loop ends when i = 12, which gets printed.
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