通过fscanf（）读取的值未打印出来

Question

I am trying to print out the first 3 line from a text file.

states 10
start  0
accept 9

Code:

int main(int argc, char*argv[]){
    FILE *fp;
    fp = fopen(argv[1], "r");   
    printf("File is open successfully.\n");
    char *ptr, buf[256];
    int states; //states
    int start; //start
    int accept; //accept

    while((ptr = fgets(buf, 256, fp)) != NULL){
        printf("%s", ptr);
        //process this line from the file
    }
    printf("============================\n");
    char s1[100], s2[100], s3[100];
    fscanf("%s %i",s1, &states);
    fscanf("%s %i",s2, &start);
    fscanf("%s %i",s3, &accept);
    printf("states: %i\n start: %i\n accpet: %i\n", states, start, accept);
}

The output I am receiving:

states: 32528
start: -29575952
accpet: 32767

After printing out the what's in the file. and prints out the random number, I cannot seem to get the states, start, and accept number.

Thanks.

Answer 1

It seems you don't use fscanf properly. The first argument should be file descriptor:

int fscanf(FILE *stream, const char *format, ...)

you can see usage (for example) at: http://www.tutorialspoint.com/c_standard_library/c_function_fscanf.htm