Input Output & Type Conversions in C++

//============================================================================
// Name        : Input Output and Type Conversions in C++
// Author      : Tarango Khan
// Team        : BRACU Byteheads
//============================================================================

#include <bits/stdc++.h>
using namespace std;

int str2int(string s) {
    stringstream ss(s);
    int x;
    ss >> x;
    return x;
}

string int2str(int a) {
    stringstream ss;
    ss << a;
    string str = ss.str();
    return str;
}

string char2str(char a) {
    stringstream ss;
    ss << a;
    string str = ss.str();
    return str;
}

string reverse(string s) {
    for (int i = 0, j = s.length() - 1; i < j; i++, j--) {
        swap(s[i], s[j]);
    }
    return s;
}

int binary2int(int num) {
    int bin = num, dec = 0, rem, base = 1;
    cin >> num;
    bin = num;
    while (num > 0) {
        rem = num % 10;
        dec = dec + rem * base;
        base = base * 2;
        num = num / 10;
    }
    cout << "The decimal equivalent of " << bin << " : " << dec << endl;
    return dec;
}

string int2binary(unsigned int val) {
    unsigned int mask = 1 << (sizeof(int) * 8 - 1);
    string s = "";
    for (int i = 0; i < (int) (sizeof(int) * 8); i++) {
        if ((val & mask) == 0) {
            s.append("0");
        } else {
            s.append("1");
        }
        mask >>= 1;
    }
    cout << "The binary equivalent of " << val << " : " << s << endl;
    return s;
}

bool is_the_double_is_integer(double value) {
    int num = ceil(value);
    double newValue = (double) num;
    if (abs(value - newValue) <= 0.00000000000001) {
        return true;
    } else {
        return false;
    }
}

string char_array_2_string(char * a) {
    int Len = strlen(a);
    string s = "";
    for (int i = 0; i < Len; i++) {
        s = s.append(char2str(a[i]));
    }
    return s;
}

char * string_2_char_array(string s) {
    int Len = s.length();
    char a[Len + 1];
    for (int i = 0; i < Len; i++) {
        a[i] = s[i];
    }
    a[Len] = '\0';
    return a;
}

string remove_leading_space(string s) {
    string t = "";
    int Len = s.length();
    int i = 0;
    while (i < Len && s[i] == ' ')
        i++;
    for (int c = i; c < Len; c++) {
        t = t.append(char2str(s[c]));
    }
    return t;
}

string remove_trailing_space(string s) {
    string t = "";
    int Len = s.length();
    int i = Len - 1;
    while (i >= 0 && s[i] == ' ')
        i--;
    for (int c = 0; c <= i; c++) {
        t = t.append(char2str(s[c]));
    }
    return t;
}

void string_input_coma_delimetre() {
    char tokenstring[] = "Hello,25.5,World,15";
    int i;
    double fp;
    char o[10], f[10], s[10], t[10];

    int result = sscanf(tokenstring, "%[^','],%[^','],%[^','],%s", o, s, t, f);
    fp = atof(s); //Convert from string to float;
    i = atoi(f); //Convert from string to int;
    printf(" %s\n %lf\n %s\n %d\n", o, fp, t, i);
}

void string_input_other_delimetre() {
    char text[120] = "hello.123.234.223";
    int a[3] = { -1, -1, -1 };
    char str[120];
    sscanf(text, "%[a-z-A-Z].%d.%d.%d", &str, &a[0], &a[1], &a[2]);

    //%[a-z-A-Z] indicate to store all characters from a to z, A to Z.
    //And you can add in any symbol and numbers such as add in 0-9 and underscore.
    //Example : %[a-z-A-Z-0-9-_]
    printf("%s, %d, %d, %d\n", str, a[0], a[1], a[2]);
}

void sscanf_known_no_of_inputs_in_a_line() {
    char sentence[] = "Rudolph is 12 years old";
    char s1[20], s2[20], s3[20], s4[20];
    int i;
    sscanf(sentence, "%s %s %d %s %s", &s1, &s2, &i, &s3, &s4);
    printf("%s\n%s\n%d\n%s\n%s\n", s1, s2, i, s3, s4);
}

void stringstream_unknown_no_of_integer_inputs_in_a_line() {
    stringstream ss;
    string input = "a b c 4 e 10 15 frd 20 50 hh 100";
    ss << input;
    int found;
    string temp;

    while (getline(ss, temp, ' ')) {
        if (stringstream(temp) >> found) {
            cout << found << endl;
        }
    }
}

void unknown_no_of_any_inputs_in_a_line() {
    char input[] = "10 12 hello 15 20 hahaha 30 Good 50";
    int Len = strlen(input);
    string s = "";
    for (int i = 0; i < Len; i++) {
        if (input[i] == ' ') {
            if (s.length() != 0) {
                if (s[0] >= '0' && s[0] <= '9') {
                    int int_value = str2int(s);
                    cout << "The int value is: " << int_value << endl;
                } else {
                    cout << "The string value is: " << s << endl;
                }
            }
            s = "";
        } else {
            s = s.append(char2str(input[i]));
        }
    }

    //For the last value:
    if (s.length() != 0) {
        if (s[0] >= '0' && s[0] <= '9') {
            int int_value = str2int(s);
            cout << "The int value is: " << int_value << endl;
        } else {
            cout << "The string value is: " << s << endl;
        }
    }
}

int main() {
    return 0;
}