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Sunday, 29 April 2012

memset example in C

Header file:
    string.h

Synopsis:
     void *memset(void *str, int ch, size_t num);

Description:
   It places character ch in first num bytes of str and returns str.


memset function C example:


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

  struct student {
        char name[30];
        char course[30];
  };

  int main() {
        struct student *ptr1, *ptr2;
        ptr1 = (struct student *) malloc (sizeof (struct student));
        ptr2 = (struct student *) malloc (sizeof (struct student));
        printf("Student name:");
        fgets(ptr1->name, 30,  stdin);
        printf("Course: ");
        fgets(ptr1->course, 30, stdin);

        printf("\nResult before memset:\nStudent name: %s", ptr1->name);
        printf("Course: %s\n", ptr1->course);

        ptr2 = (struct student *) memset(ptr1, 'c', sizeof (struct student));
        ptr2->name[29] = '\0';
        ptr2->course[29] = '\0';
        printf("\nResult after memset:\nStudent name: %s\n", ptr2->name);
        printf("Course: %s\n", ptr2->course);
        return 0;
  }



  Output:
  jp@jp-VirtualBox:~/cpgms/chap5$ ./a.out
  Student name:John milton
  Course: Computer Science

  Result before memset:
  Student name: John milton
  Course: Computer Science

  Result after memset:
  Student name: ccccccccccccccccccccccccccccc
  Course: ccccccccccccccccccccccccccccc



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