Question

In: Computer Science

Using STL stack class, implement in C++ the following pseudocodefunctioncheckBraces(aString: string) that checks for...

Using STL stack class, implement in C++ the following pseudocode function

checkBraces(aString: string) that checks for balanced braces { } in a given string /

arithmetic expressions. Write a main() program to test the function.

// Checks the string aString to verify that braces match.

// Returns true if aString contains matching braces, false otherwise.

checkBraces(aString: string): boolean{

aStack = a new empty stack
balancedSoFar = true
i =0
// Tracks character position in string
while (balancedSoFar and i < length of aString) {

ch = character at position i in aString i++
// Push an open brace
if (ch is a '{')

aStack.push('{')

// Close brace

else if (ch is a '}')

{ if (!aStack.isEmpty())
aStack.pop() // Pop a matching open brace

else
balancedSoFar = false

}

// No matching open brace // Ignore all characters other than braces

}
if (balancedSoFar and aStack.isEmpty())

aString has balanced braces else

aString does not have balanced braces

}

Expert Solution

#include

using namespace std;

//required function to check balanced braces

//acc to pseudocode

bool checkBraces(string aString){

stack aStack;

bool balancedSoFar = true;

int i = 0;

while(balancedSoFar && i < aString.size()){

char ch = aString[i];

i++;

if(ch == '{'){

aStack.push(ch);

}

else if(ch == '}'){

if(!aStack.empty()){

aStack.pop();

}

else balancedSoFar = false;

}

if(balancedSoFar && aStack.empty()){

return true;

}

else return false;

}

int main(){

string aString;

cout << "Enter the string to check for matching braces: ";

cin >> aString;

if(checkBraces(aString))cout << "balanced braces" << endl;

else cout << "unbalanced braces" << endl;

}

Sample IO:

venereology answered 2 years ago

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