measuring_the_print_speed_of_a_string.c

/*

    measuring_the_print_speed_of_a_string.c


    You can find all my C programs at Dragan Milicev's pastebin:

    https://pastebin.com/u/dmilicev

*/

#include <stdio.h>
#include <time.h>               // clock_t, clock(), CLOCKS_PER_SEC

int main(void)
{
    char string[] = "This is a string.\n";
    clock_t start_time, end_time;
    double elapsed_time1, elapsed_time2, elapsed_time3, elapsed_time4 ;

    int i;
    unsigned sum=1, n=10000;    // n is the number of terms

// 1
    start_time = clock();       // start measuring time
    for(i=1; i<=n; i++)
    {
        printf("%s", string);
    }
    end_time = clock();         // end measuring time
    elapsed_time1 = (double)(end_time - start_time) / CLOCKS_PER_SEC;
    printf("\n 1. printf , elapsed_time  =  %lf s \n", elapsed_time1);


// 2
    start_time = clock();       // start measuring time
    for(i=1; i<=n; i++)
    {
        fprintf(stdout,"%s",string);
//      putc('\n',stdout);
    }
    end_time = clock();         // end measuring time
    elapsed_time2 = (double)(end_time - start_time) / CLOCKS_PER_SEC;
    printf("\n 2. fprintf , elapsed_time     =  %lf s \n", elapsed_time2);


// 3
    start_time = clock();       // start measuring time
    for(i=1; i<=n; i++)
    {
        puts(string);
    }
    end_time = clock();         // end measuring time
    elapsed_time3 = (double)(end_time - start_time) / CLOCKS_PER_SEC;
    printf("\n 3. puts , elapsed_time    =  %lf s \n", elapsed_time3);


// 4
    start_time = clock();       // start measuring time
    for(i=1; i<=n; i++)
    {
        fputs(string,stdout);
    }
    end_time = clock();         // end measuring time
    elapsed_time4 = (double)(end_time - start_time) / CLOCKS_PER_SEC;
    printf("\n 4. fputs , elapsed_time =  %lf s \n\n", elapsed_time4);


    printf("\n    Results : \n");
    printf("\n 1. printf , elapsed_time  =  %lf s \n", elapsed_time1);
    printf("\n 2. fprintf , elapsed_time =  %lf s \n", elapsed_time2);
    printf("\n 3. puts , elapsed_time    =  %lf s \n", elapsed_time3);
    printf("\n 4. fputs , elapsed_time   =  %lf s \n", elapsed_time4);


    return 0;

} // main()