How to make if-statement print required the result? - c

Question

This code has one problem. The problem is in
Problem in if-statement
if(all_digits(to_find) && strlen(to_find) == 13)
Whenever I enter 13 characters but not from the file then it gives me a message of else statement but printing Found. Hello World! also. Although Found. Hello World! is in if-statement. It should not be printed. How to make if-statement work correctly?
#include <stdio.h>
#include <string.h>
#include <ctype.h>
int all_digits(char *s){
for (; *s!=0; s++){
if (!isdigit(*s)){
return 0;
}
}
return 1;
}
Another part of code
int main(){
FILE * fr = fopen("file.csv", "r");
char save[500], line[200], to_find[50];
int oneByOne = 0, numberOfFields=8;
char *word = NULL;
printf("Enter the ID card number: ");
scanf("%s", to_find);
if(all_digits(to_find) && strlen(to_find) == 13){
while(fgets(line, 200, fr)){
word = strtok(line, "\n");
strcpy(save, line);
if (strstr(save, to_find)){
char *wordone = strtok(save, ",");
while (wordone != NULL){
printf("Here are your details: %s\n", wordone);
wordone = strtok(NULL, ",");
}
}
}
fclose(fr);
printf("Found. Hello World!\n");
}
else {
printf("enter correclty\n");
}
return 0;
}

Answer 1

To run multiple tests without cascading if-thens you can use an error flag along with a one-time loop like so:
int err = 0; /* Be optimistic! (0 indicates success) */
do {
if (!test1-passed) {
err = 1;
break;
}
if (!test2-passed) {
err = 2;
break;
}
...
if (!testN-passed) {
err = N;
break;
}
printf("Success! All tests passed");
} while (0);
if (err) {
printf("Test %d failed", err);
}
Applied to you particular problem the code might look like this
... /* definitions here */
int err = 0; /* Be optimistic! (0 indicates success) */
do {
... /* input here */
do {
if (!all_digits(to_find)) {
err = 1;
break;
}
if (strlen(to_find) != 13) {
err = 2;
break;
}
{
err = 3 /* be pessimistic! */
while(fgets(line, 200, fr)){
/* word = strtok(line, "\n"); */ /* word is not needed. */
strcpy(save, line); /* Introducing save here is not necessary,
all following operation can be applied to line. */
if (strstr(save, to_find)){
char *wordone = strtok(save, ",");
while (wordone != NULL){
printf("Here are your details: %s\n", wordone);
wordone = strtok(NULL, ",");
err = 0; /* Phew, we are lucky! */
}
}
}
if (err) {
break;
}
}
printf("Success! All tests passed");
} while (0);
if (err) {
printf("Test %d failed", err);
}
} while (err);