Answer to Question #188879 in C++ for Asad

Question

Input a string from user in the following format:  Name_RollNo_GPA.

Now perform string tokenization operation on this string to separate the Roll no and GPA. Store each token in a separate row of 2d char array and then print that string. Plus store name in a string, roll no in integer and GPA in float. And also print them. You are not allowed to use atoi() and atof().

 

Note: You cannot call built in function of strtok()

 

Answer 1

#include <iostream>
#include <string>
using namespace std;
int main(){
    cout<<"Input token: "; //e.g lucas_23_4.5
    char c[2][20];
    string name = "", r = "", g = "";
    int roll;
    float gpa;


    cin>>c[0];
    int i = 0, prev, count = 0;
    for(int j = 0; j < 1; j++){
        while(c[j][i] != '\0'){
            if(c[j][i] == '_'){
                if(count == 0)for(int k = 0; k < i; k++){
                    name += c[j][k];
                    prev = i;
                    if(k + 1 == i) count++;
                }
                else if(count == 1) for(int k = prev + 1; k < i; k++){
                    r += c[j][k];
                    prev = i;
                    if(k + 1 == i){
                        count++;
                        i++;
                        break;
                    };
                }
            }


            if(count == 2) g += c[j][i];
            i++;
        }
    }
    roll = stoi(r);
    gpa = stof(g);
    cout<<c[0]<<endl;
    cout<<name<<endl;
    cout<<roll<<endl;
    cout<<gpa<<endl;
    return 0;
}