[FIXED] How to read input from stdin until EOF read line by line with each line containing four space separated integers in C

Issue

How to read input from stdin until EOF read line by line with each line containing four space separated integers in C. It could be inputted by commands like this:

$ echo 1 2 3 4 | ./myProgram

or

$ cat file.txt
1 2 3 4
0 -3 2 -4

$ ./myProgram < file.txt
"This is where it would output my calculations"

Then I want to save the individual integers to int variables.

char strCoordinates[101];
    char *ptr;
    int coordinates[4];
    long int tempCoordinates;
    while(scanf("%s", strCoordinates) != EOF) {
        tempCoordinates = strtol(strCoordinates, &ptr, 10);
        int lastDigit = 0;
        for (int x = 4; x >= 4; x--) {
            lastDigit = tempCoordinates % 10;
            coordinates[x] = lastDigit;
            tempCoordinates = (tempCoordinates - lastDigit) / 10;
            }
    }

This is what I was trying but it seems way to complicated . . .

Any help would be greatly apprecated. Not sure whether to use scanf(), sscanf(), fscanf(), gets()

Solution

Examples of One way

char strCoordinates[101];
char *ptr;
int coordinates[4];
while(fgets(strCoordinates, sizeof(strCoordinates), stdin) != NULL) {
    char *s = strCoordinates;
    for (int x = 0; x < 4; x++) {
        coordinates[x] = strtol(s, &ptr, 10);
        s = ptr;
    }
    printf("%d,%d,%d,%d\n", coordinates[0],coordinates[1],coordinates[2],coordinates[3]);
}

Answered By - BLUEPIXY

Answer Checked By - David Marino (PHPFixing Volunteer)