如何在C中使用fscanf从文本文件中仅读取数字

Question

For part of my program i have to get info from a text file called "options.txt". This file is like that:

Team number 10
win point 2
draw point 1
lose point -1

I Wrote this code but it fill the options array with only zeros:

int options[4];
getOptions(){
    FILE *filePtr;
    if((filePtr=fopen("options.txt","r"))==NULL){
        puts("file could not be opened");
    } else {
        for(i=0;i<4;i++) {
            fscanf(filePtr, "%d", &options[i] );
        }
    const int teamNumber=ayarlar[0]; //first element of the array is teamNumber
    struct teams team[teamNumber]; // teamNumber necessary for teams
}

Answer 1

You can use scanf("%*[^-0-9]"); to scan and discard all characters that are not digits or - . So then you loop looks like:

    for(i=0;i<4;i++) {
        fscanf(filePtr, "%*[-0-9]");
        if (fscanf(filePtr, "%d", &options[i] ) != 1)
            fprintf(stderr, "error reading file");
    }

Note that you should ALWAYS check the return value of scanf before using any of the resulting values, to ensure that they were successfully read and converted.