How to get multiple inputs in one line in C? - c

Question

I know that I can use
scanf("%d %d %d",&a,&b,&c):
But what if the user first determines how many input there'd be in the line?

Answer 1

You are reading the number of inputs and then repeatedly (in a loop) read each input, eg:
#include <stdio.h>
#include <stdlib.h>
int main(int ac, char **av)
{
int numInputs;
int *input;
printf("Total number of inputs: ");
scanf("%d", &numInputs);
input = malloc(numInputs * sizeof(int));
for (int i=0; i < numInputs; i++)
{
printf("Input #%d: ", i+1);
scanf("%d", &input[i]);
}
// Do Stuff, for example print them:
for (int i=0; i < numInputs; i++)
{
printf("Input #%d = %d\n", i+1, input[i]);
}
free(input);
}

Answer 2

Read in the whole line, then use a loop to parse out what you need.
To get you started:
1) Here is the manual page for getline(3):
http://man7.org/linux/man-pages/man3/getline.3.html
2) Some alternatves to getline:
How to read a line from the console in C?
3) Consider compressing spaces:
How do I replace multiple spaces with a single space?
4) Use a loop for parsing. You might consider tokenizing:
Tokenizing strings in C
5) Be careful and remember that your user could enter anything.

Answer 3

#include <conio.h>
#include <stdio.h>
main()
{
int a[100],i,n_input,inputs;
printf("Enter the number of inputs");
scanf("%d",&n_input);
for(i=0;i<n_input;i++)
{
printf("Input #%d: ",i+1);
scanf("%d",&a[i]);
}
for(i=0;i<n_input;i++)
{
printf("\nInput #%d: %d ",i+1,a[i]);
}
}

Answer 4

/*
_______________This program is in C Programming Language_______________
We have to directly enter all the elements in one line giving spaces between them. Compiler will automatically ends the for loop I have used and assign the value to their respective variables or array indexes. Below program and output will give you better understanding.
*/
#include <stdio.h>
int main()
{
//taking no of inputs from user
int len;
printf("Enter the number of inputs you want to enter : ");
scanf("%d", &len);
int i;
//defined an array for storing multiple outputs
int arr[100];
//included a printf statement for better understanding of end user
printf("Enter the inputs here by giving space after each input : ");
/*here is the important lines of codess for taking multiple inputs on one line*/
for (i=0;i<len;i++)
{
scanf("%d", &arr[i]);
}
printf("Your entered elements is : ");
for (i=0;i<len;i++)
{
printf("%d ", arr[i]);
}
}
/*
OUTPUT :
Enter the number of inputs you want to enter : 5
5 5 5 8 7
Your entered elements is : 5 5 5 8 7
*/