从文本文件中读取并使用 c 中的数据

Question

to write arrray and structures in a given text file and retrieving it to us in calculation can somebody help me with a sample code this is my code

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

int main()
{   FILE *file1;
    FILE *file2;//declaring two file pointers file1 to read,and file2 to read

    file1=fopen("data.txt","w"); //creating a new text file in writing mode
    int array1[12],i;//declared array1 which we will input the data in 


    for(i=0;i<=12;i++){
     scanf("%d",&array1[i]);//i am trying to use a for loop to input elements into arrar
      fprintf(file1,array1);//am trying to write the gotten values into file1
    }

    fclose(file1);

    file2=fopen("data.txt","r");//in read mode a file2 poninter
    int array2[12]; //another array of same number of elements to store the data read from file
    while(!feof(file2)){ //to get all the values inthe text file
    for(i=1;1<=12;i++){
    fscanf(file2,"%d",&array2[i]);//from here i am just confused
    printf("%d",array2[12]);
    }

    }
    fclose(file2);

}

Answer 1

• array1 and array2 are declared to hold 12 elements each ieelements numbered from 0 to 11(total 12).The for loops need to accommodate this fact.`
• fprintf requires three arguments int fprintf(FILE *fptr, const char *str, ...);

Please take notice of the comments posted by @Some programmer dude and @Jabberwocky

Implementing the corrections your code should look like this......have placed comments where I made changes.....hope they are helpful....

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

int main()
{   
  FILE *file1;
  FILE *file2;

  file1=fopen("data.txt","w"); 
  int array1[12],i;

  if(file1 != NULL){
    for(i=0;i<12;i++){//i needs to be less than 12
      scanf("%d",&array1[i]);
      fprintf(file1,"%d\n",array1[i]);//fprintf needs three arguments
    }
  }

  fclose(file1);

  file2=fopen("data.txt","r");
  int array2[12]; 
  if(file2 != NULL){ //to get all the values inthe text file
    for(i=0;i<12;i++){//i needs to be less than 12
      fscanf(file2,"%d",&array2[i]);
      printf("%d\n",array2[i]);
    }
  }
  fclose(file2);
}

I will leave error handling (if the file fails to open) as an exercise for you.