gcvt - Linux
Overview
gcvt
converts a double-precision floating-point number into a null-terminated string. This command is useful for converting numbers to strings for output or storage purposes.
Syntax
gcvt(number, ndigit, buf)
Parameters:
- number: The double-precision floating-point number to convert.
- ndigit: The maximum number of digits to use in the conversion.
- buf: A buffer to store the converted string.
Options/Flags
gcvt
does not support any options or flags.
Examples
Simple Example:
Convert the number 3.1415926535 to a string and store it in the result
buffer:
#include <stdio.h>
#include <stdlib.h>
int main() {
const double number = 3.1415926535;
char result[100];
gcvt(number, 8, result);
printf("%s\n", result); // Output: "3.1415927"
}
Complex Example:
Convert the number 123456789.123456789 to a string with 15 digits:
#include <stdio.h>
#include <stdlib.h>
int main() {
const double number = 123456789.123456789;
char result[100];
gcvt(number, 15, result);
printf("%s\n", result); // Output: "123456789.12346"
}
Common Issues
- Buffer size: Ensure that the provided buffer is large enough to hold the converted string.
- Number range:
gcvt
can convert numbers within the range of approximately 10^-308 to 10^308.
Integration
gcvt
can be integrated with other commands for various tasks:
- Formatting output: Use
gcvt
to convert numeric values to strings for display or storage in files. - Data manipulation: Combine
gcvt
withsscanf
orstrtod
to convert between strings and numbers. - Error handling: Check the return value of
gcvt
to detect potential errors during conversion.
Related Commands
printf
sscanf
strtod