Discussion: Count the Digits
Execute the code to understand the output and gain insights into the format specifier.
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#include <stdio.h>#include <math.h>int main(){printf("%2.4f\n", M_PI); /* M_PI = 3.14159265358979323846 */return(0);}
Understanding the output
The defined constant M_PI is declared in the math.h header file. It represents the value of π out to 20 digits. Any floating point value could be specified in the printf() statement, though M_PI represents a known value with oodles of digits after the decimal.
The %2.4f placeholder directs the printf() statement to output a floating point value in a width of six digits: a ...