C Programming - Library Functions


What is the purpose of fflush() function.

A. flushes all streams and specified streams.
B. flushes only specified stream.
C. flushes input/output buffer.
D. flushes file buffer.

Answer: Option A


"fflush()" flush any buffered output associated with filename, which is either a file opened for writing or a shell command for redirecting output to a pipe or coprocess.

fflush(NULL); flushes all streams.


Can you use the fprintf() to display the output on the screen?

A. Yes
B. No

Answer: Option A


Do like this fprintf(stdout, "%s %d %f", str, i, a);


What will the function randomize() do in Turbo C under DOS?

A. returns a random number.
B. returns a random number generator in the specified range.
C. returns a random number generator with a random value based on time.
D. return a random number with a given seed value.

Answer: Option C


The randomize() function initializes the random number generator with a random value based on time. You can try the sample program given below in Turbo-C, it may not work as expected in other compilers.

/* Prints a random number in the range 0 to 99 */

#include <stdlib.h>
#include <stdio.h>
#include <time.h>

int main(void)
    printf("Random number in the 0-99 range: %d\n", random (100));
    return 0;

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