Writing to a file

This is a discussion on Writing to a file within the C Programming forums, part of the General Programming Boards category; Hi, I'm new to programming with c and I'm stuck with a small problem. I need to write a c ...

  1. #1
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    Mar 2013
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    1

    Writing to a file

    Hi, I'm new to programming with c and I'm stuck with a small problem. I need to write a c program that opens a file in note pad.
    The first line is the number 5, for how many rows of binary strings are to follow. Each line contains a string representing a binary number (with a maximum of 32 binary digits)
    The program is supposed to read this file, and convert each binary number to base 10.

    This is the binary code to test:
    5
    0110010101010100100101
    10110
    10000
    01101101111001
    1000000000001

    And the programs supposed to write the results to a file called "results.txt"

    here is what I've go:

    Code:
    #include <stdio.h>
    int main (){
    /* file input guide */
    
    
    FILE *fPtr;
    
    
    int i=33;
    int j=6;
    char name [33]= "d1.txt";
    for (i=0;i<33;i++){
    
    
        sprintf(name, "binary%03d.txt", i);
    
    
    
    
    if((fPtr = fopen("data.dat","w")) == NULL){
    
    
       printf("file data.dat could not be opened\n");
    }else{
       /* file processing follows */
    
    
       fprintf(fPtr,"5\n0110010101010100100101\n10110\n10000\n01101101111001\n1000000000001\n",i,j);
    
    
       fclose(fPtr);
    
    
    }
    
    
    }
    return 0;
    }

  2. #2
    C++ Witch laserlight's Avatar
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    Singapore
    Posts
    22,306
    For starters, you need to format and indent your code properly, e.g.,
    Code:
    #include <stdio.h>
    
    int main() {
        /* file input guide */
    
        FILE *fPtr;
    
        int i = 33;
        int j = 6;
        char name[33] = "d1.txt";
        for (i = 0; i < 33; i++) {
            sprintf(name, "binary%03d.txt", i);
    
            if ((fPtr = fopen("data.dat", "w")) == NULL) {
                printf("file data.dat could not be opened\n");
            } else {
                /* file processing follows */
    
                fprintf(fPtr, "5\n0110010101010100100101\n10110\n10000\n01101101111001\n1000000000001\n", i, j);
    
                fclose(fPtr);
            }
        }
        return 0;
    }
    Next, it looks like you are writing to the file rather than reading from it.
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