जब कोई तत्व डाला या हटाया जाता है, तो वेक्टर स्वचालित रूप से गतिशील सरणी की तरह आकार बदलने की क्षमता रखता है, कंटेनर स्वचालित रूप से अपने भंडारण को संभालता है।
वेक्टर आकार () और वेक्टर रिजर्व () के बीच मुख्य अंतर यह है कि आकार बदलने () का उपयोग वेक्टर के आकार को बदलने के लिए किया जाता है जहां रिजर्व () नहीं है। आरक्षित () का उपयोग केवल निर्दिष्ट तत्वों की कम से कम संख्या को संग्रहीत करने के लिए किया जाता है। स्मृति को पुन:आवंटित किए बिना। लेकिन आकार () में, यदि संख्या वर्तमान संख्या से छोटी है तो यह मेमोरी का आकार बदल देती है और इसके ऊपर की अतिरिक्त जगह को हटा देती है।
वेक्टर ::आकार बदलें ()
वेक्टर आकार () का उपयोग इसके आकार को बदलने के लिए किया जाता है।
उदाहरण
स्रोत कोड में चरण:
Begin Declare a variable v of vector type. Declare another variable it as iterator of vector type. Declare another two variable c and i of the integer datatype. while (1) do print “1.Size of the Vector”. print “2.Insert Element into the Vector”. print “3.Resize the vector”. print “4.Display by Iterator”. print “5.Exit”. print “Enter your Choice:”. Enter the value of variable c. Switch(c) Case 1. Print “Size of Vector:”. Call size() function to print the size of the vector. Break. Case 2. Print “Enter value to be inserted:”. Enter the value of variable i. Call push_back() function to input the values in the vector. Break. Case 3. Print “Resize the vector elements:”. Call resize() function to resize the vector. Break. Case 4. Print “Displaying Vector by Iterator:”. for (it = v.begin(); it != v.end(); it++) print the value of iterator it. Break. case 5. call exit() function to take exit. break. Default. Print “Wrong choice”. End.
उदाहरण
#include <iostream> #include <vector> using namespace std; int main() { vector<int> v; vector<int>::iterator it; int c, i; while (1) { cout<<"1.Size of the Vector"<<endl; cout<<"2.Insert Element into the Vector"<<endl; cout<<"3.Resize the vector"<<endl; cout<<"4.Display by Iterator"<<endl; cout<<"5.Exit"<<endl; cout<<"Enter your Choice: "; cin>>c; switch(c) { case 1: cout<<"Size of Vector: "; cout<<v.size()<<endl; //printing the size of vector break; case 2: cout<<"Enter value to be inserted: "; cin>>i; v.push_back(i); //inserting values break; case 3: cout<<"Resize the vector elements:"<<endl; v.resize(4); / /resize the vector break; case 4: cout<<"Displaying Vector by Iterator: "; for (it = v.begin(); it != v.end(); it++) //printing all values of the vector { cout<<*it<<" "; } cout<<endl; break; case 5: exit(1); break; default: cout<<"Wrong Choice"<<endl; } } return 0; }
आउटपुट
1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 1 Size of Vector: 0 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 1 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 2 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 4 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 5 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 5 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 4 Displaying Vector by Iterator: 1 2 4 5 5 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 3 Resize the vector elements: 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 4 Displaying Vector by Iterator: 1 2 4 5 1.Size of the Vector 2.Insert Element into the Vector 3.Resize the vector 4.Display by Iterator 5.Exit Enter your Choice: 5
वेक्टर::रिजर्व ()
वेक्टर रिजर्व () इंगित करता है कि वेक्टर इस तरह बनाया गया है कि यह स्मृति को पुनः आवंटित किए बिना कम से कम निर्दिष्ट तत्वों की संख्या को संग्रहीत कर सकता है।
स्रोत कोड में चरण
Begin Declare a variable v of vector type. Declare another variable it as iterator of vector type. Declare another two variable c and i to the ineger datatype. while (TRUE) do print “1.Size of the Vector”. print “2.Insert Element into the Vector”. print “3.Reserve the vector”. print “4.Display by Iterator”. print “5.Exit”. print “Enter your Choice:”. Enter the value of variable c. Switch(c) Case 1. Print “Size of Vector:”. Call size() function to print the size of the vector. Break. Case 2. Print “Enter value to be inserted:”. Enter the value of variable i. Call push_back() function to input the values in the vector. Break. Case 3. Print “Reserve the vector elements:”. Call reserve() function to reserve the size of the vector. Break. Case 4. Print “Displaying Vector by Iterator:”. for (it = v.begin(); it != v.end(); it++) print the value of iterator it. Break. case 5. call exit() function to take exit. break. Default. Print “Wrong choice”. End.
उदाहरण
#include <iostream> #include <vector> using namespace std; int main() { vector<int> v; vector<int>::iterator it; int c, i; while (1) { cout<<"1.Size of the Vector"<<endl; cout<<"2.Insert Element into the Vector"<<endl; cout<<"3.Reserve the vector"<<endl; cout<<"4.Display by Iterator"<<endl; cout<<"5.Exit"<<endl; cout<<"Enter your Choice: "; cin>>c; switch(c) { case 1: cout<<"Size of Vector: "; cout<<v.size()<<endl; break; case 2: cout<<"Enter value to be inserted: "; cin>>i; v.push_back(i); break; case 3: cout<<"Reserve the vector elements:"<<endl; v.reserve(100); //reserve the vector elements break; case 4: cout<<"Displaying Vector by Iterator: "; for (it = v.begin(); it != v.end(); it++) { cout<<*it<<" "; } cout<<endl; break; case 5: exit(1); break; default: cout<<"Wrong Choice"<<endl; } } return 0; }
आउटपुट
1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 1 Size of Vector: 0 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 1 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 2 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 3 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 4 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 2 Enter value to be inserted: 5 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 3 Reserve the vector elements: 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 4 Displaying Vector by Iterator: 1 2 3 4 5 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit Enter your Choice: 4 Displaying Vector by Iterator: 1 2 3 4 5 1.Size of the Vector 2.Insert Element into the Vector 3.Reserve the vector 4.Display by Iterator 5.Exit