The difference between f and lf in C language

In C language, the f format specifier prints the decimal format of a floating-point variable, retaining 6 significant digits after the decimal point; the lf format specifier prints the long decimal format, retaining 12 significant digits after the decimal point.

The difference between f and lf in C language

In C language, f and lf are format specifiers used to specify the format used when printing floating-point variables. Their specific differences are as follows:

f Format specifier

• Print the decimal format of floating point variables, retaining 6 digits after the decimal point effective number.
• Use decimal point as decimal separator by default.
• If the field width is not specified, the printing width is the minimum width sufficient to accommodate the printed value.

lf Format specifier

• Print the long decimal format of floating point variables, retaining 12 digits after the decimal point. number.
• Use decimal point as decimal separator by default.
• If the field width is not specified, the printing width is the minimum width sufficient to accommodate the printed value.

Example

#include <stdio.h>

int main()
{
    float value = 3.14159265;

    printf("f: %.2f\n", value);
    printf("lf: %.12lf\n", value);

    return 0;
}

Output:

<code>f: 3.14
lf: 3.141592650000</code>

As can be seen from the output:

• Using f When the format specifier prints floating-point variables, 2 significant digits after the decimal point are retained.
• When printing floating-point variables using the lf format specifier, 12 significant digits after the decimal point are retained.

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