Function issue

[Learner21]

I think there is something wrong with my program I got this fom my TA and I think he kind of messed up somewhere I just don't know what to change:

#include <iostream>
using namespace std;
 
int String(char[]);
char Menu();
void Second(char, char, char[],int);
 
int main()
 
{
 
char Twinkle[80] = {' '};
char select = ' ';
char Sub_char = 'A';
char count = 'B';
char cont = 'Z';
cout <<"Please enter a string: ";
cin.getline(Twinkle, 80); 
cout <<"\n";
 
    do
    {
    select = Menu();
 
    if(select != 'A')
    {
    cout << "Invalid selection ! Please re-enter !\n";
    cin >> select;
    }
 
 
 
        char String_1[80] = {' '};
        char character = ' ';
        char sub = ' ';
        int i = 0;
        switch(select)
        {
        case 'A':
        case 'a':
            {
                cout << "Please enter the character to be scanned: ";
                cin >> character;
                cout << "Please enter the character to be substituted: ";
                cin >> sub;
                Second(character, sub, String_1, 80);            
 
                while(String_1[i] != '\0')
                {
                cout << String_1[i];
                ++i;
            }
            }
 
    }
    while(select != 'Z');
 
    system("pause");
    return 0;
    }
}
 
char Menu()
{
    cout << "Welcome to the string program ! \n";
    cout << "=============================== \n";
    cout << "A - Substitute Character \n";
    cout << "B - Count Character \n";
    cin >>select;
    return select;
}
void Second(char Ch, char Su, char Str_2[],int num_1)
{
 
    int i = 0;
    cout << Ch;
    cout << Su;
    cout << "The updated String is: "; 
 
 
 
while(Str_2[i] != '\0')
{
    if(Str_2[i] == Ch)
    {
        Str_2[i] == Su;
    }
    i++;
}
}

[weaknessforcats]

Have you tried stepping though the code using your debugger?

That will show you the program flow and reveal the contents of all your variables as you go along.

If you don't know how to use your debugger, then this program presents an excellent opportunity.

[Learner21]

Yea and I got four errors well I had to start all over so here is what I have:

char Menu();
void insrt_ch(char[], char, char); 
int main()
 
{
 
char Twinkle[80] = {' '};
char select = ' ';
char Sub_char = 'A';
char count = 'B';
char cont = 'Z';
cout <<"Please enter a string: ";
cin.getline(Twinkle, 80); 
cout <<"\n";
 
 
 
    cout << "Welcome to the string program ! \n";
    cout << "=============================== \n";
    cout << "A - Substitute Character \n";
    cout << "B - Count Character \n";
    cin >>select;
    if(select != 'A')
    {
        cout << "Invalid selection! Please re-enter!";
        cin >> select;
    }
 
 
    return select;
 
char String_1[80] = {' '};
        char character = ' ';
        char sub = ' ';
        int i = 0;
        switch(select)
        {
        case 'A':
        case 'a':
            {
                cout << "Please enter the character to be scanned: ";
                cin >> character;
                cout << "Please enter the character to be substituted: ";
                cin >> sub;
                insrt_ch(character, sub, String_1);
 

Now what I need to do since I have the second function as well and this is what I have so far I am not going to debug because I want to make sure that I have what I need. Instruction is:
Function 2: (Accept three arguments: an array and two characters, and return no value)
This function will accept an array containing the string and two characters. It will scan for the first character and when it finds the character, it will substitute the first character with the second character. Prompt for the character to be scanned and the character to be substituted in main() and pass those into the function. Its alot I know and I apologize but really I just want tknow if I am doing it right so far thanks again

[weaknessforcats]

[quote-Learner21]
insrt_ch(character, sub, String_1);
[/quote]

When you make this call, String_1 does not have the contents of Twinkle.

Also, this code:

etc....
cin >>select;
if(select != 'A')
{
cout << "Invalid selection! Please re-enter!";
cin >> select;
}


return select; <<<<<<<<<<<<<<<<<<<<<<<

char String_1[80] = {' '};
etc....

is going to have a hard time getting past this return. That is going to terminate main().