ceaser cypher

[callman]

i'm having trouble with this homework assignment. it's not compiling and it's also having other issues. any help would be awesome

#include <iostream>
#include <string.h>
using namespace std;
void revceaser (char str1[80])
{
	int i =0;
	while(i<strlen(str1)){
        str1[i] = int(str1[i]) - 3;
        i++;
	}
	cout << "Reverse Ceaser CIPHER" ;
	cout << str1<<endl;
}

void ceaser (char str1[80])
{
	int i =0;
	while(i<strlen(str1)){
        str1[i] = int(str1[i]) + 3;
        i++;
	}
    cout << "Ceaser CIPHER";
	cout << str1<<endl;
}

void reverse(char str[80])
{
    cout << "reverse cypher";
    int length = strlen(str);)
    for(int i>=0; i<=length-1; --)
        cout<<str[i];
    cout<<endl;
}


void rereverse(char str1[80])
{
    cout << "Decrypt Reverse CIPHER" ;
    int length = strlen(str1);
    for(int i=0; i<=length; i++)
        cout<<str1[i];
    cout<<endl;
}
int main()
{
    
    char str1[80];
    
    int i=0;
    
	cout << "Enter The Message to Encrypt?";
	cin.get(str1, 80);
	ceaser(str1);
	reverse(str1);
	revceaser(str1);
	rereverse(str1);
    
	getchar();
	system("PAUSE");
}

[roberts]

You have a superfluous ')' on your declaration line in reverse. Your compiler should have pointed that out.

[callman]

when i take that out it still gave me an error on the line underneath that said "expected expression" and there were also some semantic issues

[Moschops]

Many programmers read those errors and then fix them in their code.

for(int i>=0; i<=length-1; --)
This is horrific.

http://www.cplusplus.com/doc/tutorial/control/

[roberts]

I didn't even see that. I zeroed in on the first syntax error and skipped everything else.