printf不起作用

Question

This C code is supposed to create some random numbers and print them and then sort them and print them again, but it just prints the sorted numbers. Could any body help me?

    #include <stdio.h>
    #include <time.h>
    #include <stdlib.h>
    int main(){
        int i, j, k;
        float temper;
        time_t t;
        float grades[1000];
        fflush(stdout);
        printf("Here are the number\n");
        srand(time(&t));
        for(i=0;i<1000;i++){
            grades[i]=rand();
            printf("%f\n", grades[i]);
        }
        for(i=0;i<1000;i++){
            int swap=0;
            for(j=i;j<1000;j++){
                if(grades[i]>grades[j]){
                    temper=grades[i];
                    grades[i]=grades[j];
                    grades[j]=temper;
                    swap=1;
                }
            }
        }
        printf("sorting is done");
        for(i=0;i<1000;i++){
            printf("%f\n", grades[i]);
        } }

Answer 1

Your program is working correctly. Try changing everything from 1000 to 10 just to test and see for yourself.

What is happening is that it is printing everything out so quickly that the first 1000 is off the page.

Answer 2

The code is correct.

1. Try a small size to array,
2. write all the logs to a file.

Answer 3

Code worked fine for me too. Maybe your terminal is not storing enough lines for you to see the beginning of the output. You can change that in the settings for your terminal. Or you can cat them to a file instead. There is an easy option to do so if you google it. Also, add in another printf in between as a marker that is obvious like:

printf("+++++++++++++++++++++++++++ here is the break point ++++++++++++++++");

It will make it that much harder to miss it. Good luck!

PS: to cat your output to a file simply type '> filename' when running the program. I called mine math.c so when I ran I typed: '$./math > file' And the whole output in in a file named 'file'