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#1
October 18th, 2002, 05:20 AM
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need help with manipulating user input
Suppose a user enters this
cin >> 23,4545,576,43,4 Is there a way I can capture the input and split it into the individual numbers and put them in an integer array in C++. I know there is getline() but it does not allow you to keep the elements as integers. Help will be greatly appreciated.
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#2
October 18th, 2002, 07:49 AM
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You know you can always use atol() or atoi() to convert a character to a long or integer values.
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#3
October 18th, 2002, 10:35 PM
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Are there always going to be a fixed number of elements in the input?
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#5
October 19th, 2002, 08:20 PM
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You could then possibly use cin in a loop and use a char field to extract the commas out of the way, something like this:
Code:
#include <iostream>
int main(void) {
int nCount, i;
cout << "Enter number of elements: ";
cin >> nCount;
int *nElems = new int[nCount];
char cDummy;
cout << "Enter elements separated by commas below\n";
for (i=0; i < nCount-1; i++)
cin >> nElems[i] >> cDummy;
cin >> nElems[nCount - 1];
// Now print out the numbers entered
for (i = 0; i < nCount; i++)
cout << i << " => " << nElems[i] << "\n";
// clean up
delete [] nElems;
return 0;
}
Hope this helps!
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#6
October 31st, 2002, 10:57 AM
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Here's a slightly more elegant solution:
Code:
int* digit;
int digitno;
string userinput;
cout << "Enter your number: ";
cin >> userinput;
digit = (int*)calloc(userinput.length() + 1, sizeof(int));
digitno=0;
for(int i=0; i < userinput.length(); i++) {
if (isdigit(userinput[i]))
digit[digitno++] = atoi(userinput[i]);
That way the user doesn't need to know how many digits ahead of time.
__________________
Clay Dowling Lazarus Notes Articles and commentary on web development http://www.lazarusid.com/notes/
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#7
October 31st, 2002, 12:58 PM
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ClayDowling, the code you've presented won't quite work because atoi works on const char *, not char. So atoi(userinput[i]) won't work. Also it appears that your code is attempting to put each digit in a separate element of the array, which wasn't the original requirement. Interesting approach though
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#8
October 31st, 2002, 01:39 PM
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Scorpion, thanks for the heads up. Compiler would have caught that in time. So we'll change the last line of the code a bit:
Code:
digit[digitno++] = userinput[i] - '0'; Last edited by ClayDowling : October 31st, 2002 at 01:42 PM.
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#9
October 31st, 2002, 01:43 PM
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Actually I think it was individual numbers rather than individual digits, with the numbers being separated by commas on the input line.
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