Input Intricacies

Must see for specific input taking

Scanf Details

#include <stdio.h> int main()

{

    int m, n;

    scanf("(%d)-%d", &m, &n);

    printf("%d %d \n", m, n);

    // scanf accept input only if it is in same format as specified     // eg.- here if u write (8) 6 => 8 is in format

        =>m=8 but n=0 (by default) bcz not used '-'

    scanf(" (%d) - %d", &m, &n);

    printf("%d %d \n", m, n);

    // spaces doesn't matter at start or in between

    scanf("(%d)-%d ", &m, &n);

    printf("%d %d \n", m, n);

// never give space at end bcz compiler ko lgta hai ek aur value

hai aage and when u give 1 extra inputs then only it stops. => only first input get stored.

*******************************************************************

    int a;

    char c;

    scanf("%d", &a);

    //Case-1 if a=42

    //Case-2 if a=42k

    //Case-3 if a=42kl

    printf("%d\n", a);

    scanf("%c", &c);

    //Case-1 then our c is '\n'

    //Case-2 then our c is k

    //Case-3 then our c is k  (bcz char has only 1 letter)

    printf("%c \n", c);

   

//if any leftovers are there from prev. scanf then it get picked up

    return 0;

}

Cin Details

• cin>> name1; cin>> name2;
• I/P - Devankar Rohit
• O/P - Devankar only
• bcz \n after Devankar is stored as buffer and considered as input for name 2
• USE cin.ignore() --> Clears the buffer
• cin>> name1; cin.ignore(); cin>> name2;

• cin>> name1; cin>> name2;
• I/P - Devankar Raj Rohit Kumar
• O/P - Devankar Raj
• bcz after space everything is stored in buffer => Raj is stored as buffer and considered as input for name 2
• USE getline(cin, name2) --> stores whole line as I/P until we encounter \n
• getline(cin, name1) getline(cin, name2)