1. Write a program in C++ that read a CString and discard all the symbols except the digits.converts the CString to an integer and store this integer in variable and print it. (10)
Sample Output:
Enter a CString:12ty12
String convert to integer:1212
Enter a CString:69$
String convert to integer:69
Hints:Use strlen,isdigit,atoi functions
Solution:
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
char str[50];
char intStr[50];
int index=0;
cout<<"Enter a CString :";
cin>>str;
for(int i=0;i<strlen(str);i++)
{
if(isdigit(str[i]))
intStr[index++]=str[i];
}
intStr[index]='\0';
int value=atoi(intStr);
cout<<"CSting to Integer :"<<value<<endl;
system("PAUSE");
return(0);
}
2. What will be the output of this code? (5)
vector<int> v(5);
for (int k=0; k<v.size( ); k++)
v[k]=k+1;
for (int k=0; k<v.size( )/2; k++) {
int temp = v[k];
v[k] = v[v.size( )-k-1];
v[v.size( )-k-1] = temp;
}
for (int k=0; k<v.size( ); k++)
cout<< v[k]<<" ";
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3.What will be the output of this code? (5)
int x, *p1, *p2;
x = 1;
p1 = new int;
*p1 = 5;
p2 = new int;
*p2 = 3;
x = *p2;
p1 = &x;
cout << *p1 << " " << *p2 << " " << x << endl;
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