Strings and Structures

This is a discussion on Strings and Structures within the C Programming forums, part of the General Programming Boards category; I have a structure with a string defined inside it, is there a way to change the string later in ...

  1. #1
    zsaniK Kinasz's Avatar
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    Strings and Structures

    I have a structure with a string defined inside it, is there a way to change the string later in my program....

    CODE....
    //define structure
    struct myStruct {
    char name[40];
    int age;
    };

    //function to fill array of structures with values
    void fillArray(struct myStruct *);

    int main(void){
    //create array of structs
    struct myStruct myStructArray[10];

    //put values in array of structs
    fillArray(&myStructArray);

    //print name from struct
    printf("%s", myStructArray[2].name);
    }

    //fills array with values
    void fillArray(struct myStruct * workwithStruct){
    workwithStruct[2].name = "JOHN";
    return;
    }


    if i print the name inside the fillArray function it will print fine but when I return to the main function it prints garbage

    I'm new to structs, Can someone please help me out?
    "Assumptions are the mother of all **** ups!"

  2. #2
    ATH0 quzah's Avatar
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    workwithStruct[2].name = "JOHN";

    This is wrong. You have to use something like strncpy to fill the string.

    Furthermore, you're accessing your pointed to structure entirely incorrectly. That's not how you access members of a structure via a pointer.

    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
    Registered User pinko_liberal's Avatar
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    I wonder how the previous code compiled : the argument passed to the function fillarray was of the wrong type. The operator = does not copy strings in C; you have to use the function strcpy.
    It is a good idea to include the appropriate headers.

    Code:
    #include <stdio.h>
    #include <string.h>
    
    
    struct myStruct {
    char name[40];
    int age;
    };
    
    void fillArray(struct myStruct *);
    
    int main(void){
    struct myStruct myStructArray[10];
    fillArray(myStructArray);
    printf("%s", myStructArray[2].name); 
    return 0;
    }
    
    void fillArray(struct myStruct * workwithStruct){
    strcpy( (workwithStruct+2)->name,"JOHN");
    return;
    }
    The one who says it cannot be done should never interrupt the one who is doing it.

  4. #4
    zsaniK Kinasz's Avatar
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    Thankyou, that was all the help i needed

    I am new there was no reason to tear me down for doing it wrong, not everyone starts an expert!

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