C Program for Reading Integer Numbers

we can give simple example to write C Program for reading Integer Numbers. The Various input formatting options for reading integers are experimented in the program shown in below C Program. The first scanf requests input data for three integer values a, b, and c, and accordingly three values 1, 2, and 3 are keyed in.

Because of the specification %*d the value 2 has been skipped and 3 is assigned to the variable b. Notice that since no data is available for c, it contains garbage.

C Program for Reading Integer Numbers

main()
{
int a,b,c,x,y,z;
int p,q,r;
printf("Enter three integer numbers\n");
scanf("%d %*d %d",&a,&b,&c);
printf("%d %d %d \n\n",a,b,c);
printf("Enter two 4-digit numbers\n");
scanf("%2d %4d",&x,&y);
printf("%d %d\n\n", x,y);
printf("Enter two integers\n");
scanf("%d %d", &a,&x);
printf("%d %d \n\n",a,x);
printf("Enter a nine digit number\n");
scanf("%3d %4d %3d",&p,&q,&r);
printf("%d %d %d \n\n",p,q,r);
printf("Enter two three digit numbers\n");
scanf("%d %d",&x,&y);
printf("%d %d",x,y);
}

Output display as below,

Enter three integer numbers
1 2 3
1 3 -3577
Enter two 4-digit numbers
6789 4321
67 89
Enter two integers
44 66
4321 44
Enter a nine-digit number
123456789
66 1234 567
Enter two three-digit numbers
123 456
89 123

The second scanf specifies the format %2d and %4d for the variables x and y respectively. Whenever we specify field width for reading integer numbers, the input numbers should not contain more digits that the specified size.

Otherwise, the extra digits on the right-hand side will be truncated and assigned to the next variable in the list. Thus, the second scanf has truncated the four digit number 6789 and assigned 67 to x and 89 to y.

The value 4321 has been assigned to the first variable in the immediately above scanf statement.

Let me know if you find any difficulty in understanding this C Program for reading Integer Numbers and I would be glad to explain it further.