cpp/passing/replace_first Source

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Define a function <tt>void replace_first(int arr[], int n, int target,
int replacement)</tt>
that takes an array <tt>arr</tt> of length <tt>n</tt>,
finds the first entry whose value equals <tt>target</tt>, and
changes its value to <tt>replacement</tt>. If no such entry exists, do nothing.
You should not use cin or cout, that part is done for you
in order to facilitate testing.

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Choices
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e.g. [["good", true], ["bad", false]]

Correct answer
Template / Reference solution

Template / Reference solution

#include <iostream>
using namespace std;

void replace_first(int arr[], int n, int target, int replacement) {
\[
for (int i=0; i<n; i++) {
if (arr[i] == target) {
arr[i] = replacement;
return; // don't change any more!
}
}
]\
}

int main() {
// read n, t, r, then n inputs
int the_inputs[100];
int n, t, r;
cin >> n >> t >> r;
for (int i=0; i<n; i++) cin >> the_inputs[i];
cout << "Before calling your function, the array contains: ";
for (int i=0; i<n; i++) cout << the_inputs[i] << " ";
cout << endl;

// call YOUR function
replace_first(the_inputs, n, t, r);

// is the output correct?
cout << "After calling your function, the array contains: ";
for (int i=0; i<n; i++) cout << the_inputs[i] << " ";
return 0;
}

Java test suite
See manual

C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]
to just run once with no input use [{}]

[
{"stdin": "3 9 10\n2014 9 17"},
{"stdin": "8 39 103\n99 11 17 71 39 0 93 38"},
{"stdin": "8 39 103\n99 11 17 71 39 0 39 38"}
]

C++ test suite
See manual

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e.g. ["for","while"]

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i.e., just a demo
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see default_cppflags
e.g. ["-Wno-write-strings"]

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Property	Value
Description html markup shown to student	Define a function <tt>void replace_first(int arr[], int n, int target, int replacement)</tt> that takes an array <tt>arr</tt> of length <tt>n</tt>, finds the <i>first</i> entry whose value equals <tt>target</tt>, and changes its value to <tt>replacement</tt>. If no such entry exists, do nothing. <p>You should <b>not</b> use cin or cout, that part is done for you in order to facilitate testing.
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	remove
Engine
Choices json list of string, bool pairs e.g. `[["good", true], ["bad", false]]`
Correct answer
Template / Reference solution
Template / Reference solution	#include <iostream> using namespace std; void replace_first(int arr[], int n, int target, int replacement) { \[ for (int i=0; i<n; i++) { if (arr[i] == target) { arr[i] = replacement; return; // don't change any more! } } ]\ } int main() { // read n, t, r, then n inputs int the_inputs[100]; int n, t, r; cin >> n >> t >> r; for (int i=0; i<n; i++) cin >> the_inputs[i]; cout << "Before calling your function, the array contains: "; for (int i=0; i<n; i++) cout << the_inputs[i] << " "; cout << endl; // call YOUR function replace_first(the_inputs, n, t, r); // is the output correct? cout << "After calling your function, the array contains: "; for (int i=0; i<n; i++) cout << the_inputs[i] << " "; return 0; }
Java test suite See manual
C++ test suite json list of stdin/args tests e.g. `[{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]` to just run once with no input use `[{}]`	[ {"stdin": "3 9 10\n2014 9 17"}, {"stdin": "8 39 103\n99 11 17 71 39 0 93 38"}, {"stdin": "8 39 103\n99 11 17 71 39 0 39 38"} ]
C++ test suite See manual
Forbidden substrings json list of strings e.g. `["for","while"]`	remove
Solution visibility	remove
Java imports json list of importables e.g. `["java.util.*"]`	remove
Override Java classname else defaults to websheet name	remove
Dependent on other websheets? json list of websheet names in this folder e.g. `["DataStructure"]`	remove
Is example? i.e., just a demo	remove
Add compiler flag(s) json list of flags e.g. `["-Wno-unused-variable"]`	remove
Remove default compiler flag(s) json list of flags see default_cppflags e.g. `["-Wno-write-strings"]`	remove

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