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main.cpp
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#include <iostream>
#include<cstring>
#include<string>
using namespace std;
void cha(int &get, char ptr){
if(ptr == '0'){
get = 0;
}
else if(ptr == '1'){
get = 1;
}
else if(ptr == '2'){
get = 2;
}
else if(ptr == '3'){
get = 3;
}
else if(ptr == '4'){
get = 4;
}
else if(ptr == '5'){
get = 5;
}
else if(ptr == '6'){
get =6;
}
else if(ptr == '7'){
get = 7;
}
else if(ptr == '8'){
get = 8;
}
else if(ptr == '9'){
get = 9;
}
}
///...............................................
int num_c(char *ptr){ /// for c strings
bool check = false;
size_t siz= strlen(ptr);
int get;
for(int i = 0; i<strlen(ptr); ++i){
if(isdigit(ptr[i])){
check = true;
}
else{
if(ptr[i] == '-' && i==0 || ptr[i] == '+' &&i==0){
check = true;
}
else{
check = false;
cout<<"Error! not a full digit number!"<<endl;
return 0;
}
}
}
if(check){
int in;
(ptr[0] == '-' || ptr[0] =='+') ? in=1, siz-=1: in=0; ///
cha(get,ptr[in]); ///
int j =in+1;
bool check2;
(siz>1)? check2=true : check2=false; ///
if(check2){
int ch = 10;
for(;j<strlen(ptr); ++j){
if(ptr[j] == '0'){
get*=ch;
get+=0;
}
else if(ptr[j] == '1'){
get*=ch;
get+=1;
}
else if(ptr[j] == '2'){
get*=ch;
get+=2;
}
else if(ptr[j] == '3'){
get*=ch;
get+=3;
}
else if(ptr[j] == '4'){
get*=ch;
get+=4;
}
else if(ptr[j] == '5'){
get*=ch;
get+=5;
}
else if(ptr[j] == '6'){
get*=ch;
get+=6;
}
else if(ptr[j] == '7'){
get*=ch;
get+=7;
}
else if(ptr[j] == '8'){
get*=ch;
get+=8;
}
else if(ptr[j] == '9'){
get*=ch;
get+=9;
}
} ///
}
if(in!=0 && ptr[0] == '-'){
get *=-1;
}
return get;
}///
} /// end
///...............................................................................
int num_c(char ptr){ /// for c strings
bool check = false;
int get;
if(isdigit(ptr)){
check = true;
}
else{
check = false;
cout<<"Error! not a full digit number!"<<endl;
return 0;
}
if(check){
cha(get,ptr); ///
return get;
}
} ///
int main()
{
char vic[] = "67878";
cout<<num_c(vic)<<endl;
cout<<atoi(vic)<<endl;
}