Library Functions - Programming

Q1:

What will function gcvt() do?

A Convert vector to integer value

B Convert floating-point number to a string

C Convert 2D array in to 1D array.

D Covert multi Dimensional array to 1D array

ANS:B - Convert floating-point number to a string

The gcvt() function converts a floating-point number to a string. It converts given value to a null-terminated string.


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

int main(void)
{
	char str[25];
	double num;
	int sig = 5; /* significant digits */

	/* a regular number */
	num = 9.876;
	gcvt(num, sig, str);
	printf("string = %s\n", str);

	/* a negative number */
	num = -123.4567;
	gcvt(num, sig, str);
	printf("string = %s\n", str);

	/* scientific notation */
	num = 0.678e5;
	gcvt(num, sig, str);
	printf("string = %s\n", str);

	return(0);
}
Output:
string = 9.876
string = -123.46
string = 67800