input_string_and_integer_into_structure_v1.c

/*

    input_string_and_integer_into_structure_v1.c

    How to input string and integer into structure.
    Under the comments are problematic solutions.
    Best solutions are active, not commented.

    https://www.tutorialspoint.com/c_standard_library/c_function_fgets.htm


    You can find all my C programs at Dragan Milicev's pastebin:

    https://pastebin.com/u/dmilicev

*/

#include<stdio.h>

#define LEN 20  // If we use this number in several places,
                // this is a good way to define it only in one place in the program.

struct student
{
    int roll_number;
    char name[20];
};

int main(void)
{
    struct student s1;

    printf("\n Enter your student name: ");
    //gets(s1.name);    // string is without &, or:
    //scanf("%[^\n]", s1.name); // or better, to avoid buffer overflow:

    fgets(s1.name, 20, stdin);  // it will input maximum LEN-1 characters of name
                                // and add '\0' at end

    // If the attempted name entry is longer than LEN, we must empty the input buffer:
    // fflush(stdin);   // flushes the input buffer of a stream,
                        // but gives undefined behavior. Alternative is:
    // while ( ( getchar() ) != EOF && c != '\n' );
    // or:
    while ( ( getchar() ) != '\n' );

    printf("\n\n Enter your student roll number: ");
    scanf("%d",&s1.roll_number);    // required &
    printf("\n\n Student detailed are: \n");

    printf("\n name: %s \n\n roll number: %d \n\n", s1.name, s1.roll_number );

    return 0;
}