The task involves interpreting a sequence of PASCAL assignment statements for three variables: a, b, and c. Each statement follows the pattern [variable]:=[variable or single-digit integer];. All variables are initialized to 0. The sattements must be executed in order, and the final values of a, b, and c must be output.

Approach

1. Initialize an array to hold the values for a, b, and c, all set to 0.
2. Process the input string sequentially to identify each assignment operation.
3. For each assignment, deetrmine the target variable (lvalue) and the source value (rvalue). The rvalue can be a single-digit constant (0-9) or one of the three variables.
4. Update the target variable's value based on the rvalue.
5. After processing all statements, print the final values.

Implementation Details The core logic scans the input string for the assignment operator (=). When found, it examines the character immediate following the = to decide the assignment type.

• If it's a digit, the numeric value is assigned direct.
• If it's a letter, the value is copied from the corresponding variable's current storage.

The index for the target variable is derived from the character two positions before the = (accounting for the colon :). ASCII arithmetic converts characters to array indices.

Code Example

#include <iostream>
#include <string>
using namespace std;

int main() {
    string code;
    int varValues[3] = {0}; // Index 0: a, 1: b, 2: c
    cin >> code;

    for (size_t pos = 0; pos < code.length(); ++pos) {
        if (code[pos] == '=') {
            char targetVar = code[pos - 2]; // Variable before ':'
            char source = code[pos + 1];    // Character after '='

            if (source >= '0' && source <= '9') {
                // Assign numeric literal
                varValues[targetVar - 'a'] = source - '0';
            } else {
                // Copy value from another variable
                varValues[targetVar - 'a'] = varValues[source - 'a'];
            }
        }
    }

    cout << varValues[0] << " " << varValues[1] << " " << varValues[2] << endl;
    return 0;
}