Fprintf没有将数据打印到文件

Question

I am trying to get the data in my arr array to print to the file "out.txt". The program was able to do it before but for some reason will now not print at all and even after undoing to a previous version nothing will print.

I have code in place that proves both that the File is successfully opened and the data is correct in the array. All other functions work properly.

int main () {

    FILE *inFile;
    FILE *outFile;
    int n = 0;

    inFile = fopen("in.txt", "r");

    if (inFile == NULL) {
        printf("File failed to open");
    }
    outFile = fopen("out.txt", "w");

    if (outFile == NULL) {
        printf("outFile failed to open");
    }

    fscanf(inFile, "%d", &n);

    struct Point* arr;
    arr = (struct Point*) malloc (n * sizeof(struct Point));
    int i = 0;


    while (i<n){
        fscanf(inFile, "%d %d", &arr[i].x, &arr[i].y);
        i++;
    }

    mergeSort(arr, 0, n-1);

    fprintf(outFile, "%d\n", n);

    for (int i = 0; i<n; i++){
        printf("%d %d\n", arr[i].x, arr[i].y);
    }

    for (int i = 0; i<n; i++){
        fprintf(outFile, "%d %d\n", arr[i].x, arr[i].y);
    }

    printf("\nSorted and output written to File\n");

    int searchx, searchy;

    printf("Please enter a point to search for:  ");
    scanf("%d %d", &searchx, &searchy);

    int result = 0;

    result = binarySearch(arr, searchx, searchy,0, n);

    if (result == -1) {
        printf("Point not found");
        return 0;
    }
    else {
        printf("Point found in element %d", result);
    }
    fclose(inFile);
    fclose(outFile);
}

expected results with sample input. In.txt:

5
6 3
4 6
2 5
2 7
5 2 

out.txt:

5
2 5
2 7
4 6
5 2
6 3

Actual results: out.txt:

//Blank

Answer 1

That code runs fine here on my Mac, at least with the mergeSort commented out. You're not running on Windows, are you? If so the file may look empty because it's missing carriage returns.