CODEWITHSUNDEEP
cintegerprintf
user3516302
user3516302

Reputation: 81

Odd printing behavior in C

I'm trying to print out comma seperated values in my C program, but I think I keep getting memory allocations instead. When running from the command line, this happens.

1
  49 this is the response
  10 this is the response
1
  49 this is the response
  10 this is the response

Here is my program:

void main(){
    int j;
    int idnum;
    j = 0;
    char entry[99];
    do{
        idnum = get_field(entry);
        j++;
    }
    while(idnum!='\n' && idnum!= ',' && j!= MAXTYPES);
    int recur = 0;
    while (recur != 4){
        printf("%4d\n", entry[recur]);
        recur++;
    }
    printf("\nEnd of Input\n");
}

int get_field(char entry[]){
    int idnum;
    char n;
    int j = 0;
    char temp[45];
    while ((n=getchar())!= EOF){
        printf("%d this is the response\n",n);

    }
    return idnum;
}

Upvotes: 1

Views: 61

Answers (3)

R Sahu
R Sahu

Reputation: 206747

Problems I see:

  1. In get_field, you have not initialized idnum and returning it from the function.

  2. In get_field, the while loop to read the data is strange. I am not sure what you are trying to accomplish. However, you if type 1 and then press Enter, two characters are added to the input stream: '1' and '\n'. You are reading them as char, using getchar, and printing them as int (by using the "%d" format).

    That explains the output you are getting.

    49 is the decimal representation of '1'.

    10 is the decimal representation of '\n'

  3. The return type of getchar is int. You should change the type of n in get_field to int from char. That could be source of problems depending on the platform you are working in.

Upvotes: 1

Ashraful Haque
Ashraful Haque

Reputation: 559

Since n is a char type data.So,you've to use %c instead of %d Like this:

    printf("%c this is the response\n",n);

Upvotes: 0

Rohan
Rohan

Reputation: 53386

With %d you are printing the ASCII values. ASCII value of 1 is 49 and of \n is 10. These are what you are getting.

You may want to print them with %c.

Upvotes: 0

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