Input Output Question Practice C Language

Q 1. Print a character with ASCII code using printf function?

Q 2. Try to string input with space using %s?

Q 3. Write down short notes with example on following function

Fclose

Puts

Gets

Fprintf

Scanf

Q 4. Write a program to input more than one character using single scanf function?

Q 5. What are the special character used inside of printf function?

Q 6.  Find the output of following code

Code 1 :

void main()

{

     char ch=65;

     printf("\n\t%c",ch);

}

Code 2:

void main()

{

    int a=1,b=2,c=3;

    printf("\n\t%d %d %d");

   

}

Output : 3 2 1

Because compiler of C maintain global area of variable stack that is why output in decending order

Code 3:

void main()

{

    int a;

    printf("\n%d",scanf(“%d”,&a));

   

}

Output : 1

Because return type of scanf function is one if takes takes place successfully otherwise zero. So when enter number and press enter then input gets complete and scanf returns 1 which is here use for printf function.

Code 4:

void main()

{

    char *str="Girfa:Student Help";

    printf("%s",str+6);

}

Output :  Student Help

Str is a character array pointer. Name of an array is constant pointer which store first element (base) address. When add 6 by base address then its skip 6 characters.

Code 5:

void main()

{

    printf("%d",printf("Girfa:Student Help")); 

}

Output : Girfa:Student  Help 18

Inner printf genrate its output before outer printf which is Girfa:Student Help, Then outer printf print number of character in innner printf which is 18.

Code 6:

void main()

{

    printf("\n\t%c",65);

}

Output : A

%c is design to print a character using ASCII code, 65 is ASCII of A

Code 7:

void main()

{

    char ch=97;

    printf("\n\t%d is ASCII code of %d",ch,ch);

}

Output : 97 is ASCII code of a

Every character of keyboard has a unique code which is known as ASCII code So a ASCII code is 97. %d is use to print ASCII code and %c is use to print related character of 97.

Code 8:

void main()

{

    double a;

    printf("\n\t %d",&a);

}

Output : Garbase

& is known as address operator in C language which returns physcial address of a variable. Normally address value is greater than 32767 and %d is design to print upto 32767.So overflow occur here.

Code 9:

void main()

{

    int a;

    float b;

    char c;

    printf("Enter Integer, Float and character input>> ");

    scanf("%d%f%c",&a,&b,&c);

    printf("\n\tInt=%d\tFloat=%f\tChar=%c",a,b,c);

}

Output : You will not be able to take input in character variable.

You can take more than input though single scanf function , here %c is use in last.when this program will run you’ll press enter after every input. Enter is also a character which ASCII is 13 so variable c will assign enter and you will see anything in character varaible while printing.

Code 10:

void main()

{

    printf("\n\t%d",getch());

}

Output : Print ASCII of pressed character by keyboard

Getch function wait a any key press from keyboard and returns ASCII of pressed character which is print by using %d

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