Time elapsed between two function calls using program in C programming language ?

How do I get the time elapsed between two function calls ?

Ans: The function difftime( ) finds the difference between two times. It calculates the elapsed time in seconds and returns the difference between two times as a double value.

#include 

#include 

#include 

main( )

{

int a[] = { 2, -34, 56, 78, 112, 33, -7, 11, 45, 29, 6 } ;

int s ;

time_t t1, t2 ; // time_t defines the value used for time function

s = sizeof ( a ) / 2 ;

t1 = time ( NULL ) ;

sel_sort ( a, s ) ; // sort array by selection sort

bub_sort ( a, s ) ; // sort array by bubble sort method

t2 = time ( NULL ) ;

printf ( "\nThe difference between two function calls is %f", difftime (

t2, t1 ) ) ;

}

In the above program we have called difftime( ) function that returns the time elapsed from t1 to t2.

88. General

main( )

{

char *s ;

s = fun ( 128, 2 ) ;

printf ( "\n%s", s ) ;

}

fun ( unsigned int num, int base )

{

static char buff[33] ;

char *ptr ;

ptr = &buff [ sizeof ( buff ) - 1 ] ;

*ptr = '\0' ;

do

{

*--ptr = "0123456789abcdef"[ num % base ] ;

num /= base ;

} while ( num != 0 ) ;

return ptr ;

}

The above program would convert the number 128 to the base 2. You can convert a number to a hexadecimal or octal form by passing the number and the base, to the function fun( ).