#include <cstring>
#include <string>
#include <iostream>
#define max 1000
using namespace std;
struct block // the structure of block
{
int index; // the index of the block
string text; // the text that the user want to store
string p_hash; // previous hash value
string hash; // hash value
block *next; // linked list
};
struct blockchain // the structure of blockchain
{
struct block block_array[max]; // define a maximum of 1000 blocks in the blockchain
int max_size;
};
string hash_function(string s) // the hash function
{
string input(s);
SHA1 checksum;
checksum.update(input);
char hash[41];
strcpy(hash, checksum.final().c_str());
return hash;
}
void add_block(blockchain *block) // add block
{
if (block->max_size == max)
{
cout << "Input failure." << endl;
return;
}
else
{
cout << "Enter the index of blocks you want to add: ";
int add_index = 0;
cin >> add_index; // confirm the index of the added block
if (add_index > 0)
{
int new_size;
new_size = block->max_size + add_index;
for (int i = block->max_size; i < new_size; i++)
{
string text;
string p_hash;
string hash;
cout << endl;
cout << "\tPlease enter the imformation of block No." << i + 1 << endl;
cout << "\tPlease enter the text: ";
text = "\n";
getline(cin, text);
block->block_array[i].index = i + 1;
block->block_array[i].text = text;
block->block_array[i].p_hash = p_hash;
block->block_array[i].hash = hash;
p_hash = hash;
block->max_size++;
}
}
}
}
int main()
{
blockchain block;
block.max_size = 0;
add_block(&block);
}
当我在add——block中添加时,使用getline会跳过i = 0而直接到i = 1。即在i = 0时无法输入,想问原因。