CODEWITHSUNDEEP
cstringparsingint
Mahmoud
Mahmoud

Reputation: 197

Parse string " comes from a file " to integer

I am making a program in C that reads a line from file and displays this line on screen My homework requires that the file must get a number from the file and make some operations on it.

I get the file content and put it in an array:

while ( fgets ( line, sizeof line, file ) != NULL ) 
    {        
        strcpy(arra[i], line);
        printf("array ----> %d \n", arra[i]);
        i++;        
    }

how can I parse this content to int ?

Upvotes: 1

Views: 241

Answers (3)

BLUEPIXY
BLUEPIXY

Reputation: 40145

#include <stdio.h>
#include <stdlib.h>

#define MAX_DATA_SIZE 10

int main(){
    FILE *file;
    char line[128];
    int array[MAX_DATA_SIZE];
    int i,count,sum;

    file = fopen("data.txt","r");
/* data.txt:
100
201
5
-6
0
*/
    for(i=0; NULL!=fgets(line, sizeof(line), file); ++i){
        if(i == MAX_DATA_SIZE){
            fprintf(stderr,"exceeded the size of the array.\n");
            exit(EXIT_FAILURE);
        }
        array[i]=atoi(line);
    }
    fclose(file);
    /*some operations */
    count = i;
    sum = 0;
    for(i=0;i<count;++i)
        sum += array[i];
    printf("%d\n",sum);

    return 0;
}

Upvotes: 1

bart s
bart s

Reputation: 5100

you can use atoi()

int x = atoi("string");

From your code sample

while ( fgets ( line, sizeof line, file ) != NULL ) 
{        
    strcpy(arra[i], line);
    printf("array ----> %d \n", atoi(arra[i]));
    i++;        
}

Upvotes: 3

Luchian Grigore
Luchian Grigore

Reputation: 258628

If line is a char*, you can use atoi to convert it to an integer.

printf("array ----> %d \n", atoi(line));

Upvotes: 3

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