Thread: why the output is 32?

  1. #1
    Registered User
    Join Date
    Jul 2012

    why the output is 32?

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    int main()
        struct jb{
            char actor[25];
            struct jb *next;
        struct jb *bond;
        int n;
        /* Create the first structure in the list */
        bond = (struct jb *)malloc(sizeof(struct jb));
        printf("struct jb sizeof is %d\n", n = sizeof(struct jb));
        printf("struct bond->actor sizeof is %d\n", n = sizeof(bond->actor));
        printf("struct bond->next sizeof is %d\n", n = sizeof(bond->next));
        /* Fill the structure */
        strcpy(bond->actor, "Sean Connery");
        bond->next = NULL;                        /* End of list */
        /* Display the results */
        printf("The first structure has been created:\n");
        printf("\tbond->actor = %s\n", bond->actor);
        printf("\tnext structure address = %p\n", bond->next);
    the output:

    struct jb sizeof is 32


    but the array is 25, and pointer is 4, why the struct jb sizeof is not 29?

  2. #2
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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