我正在尝试将6个十六进制数字的字符串转换为0xffffff类型的格式。 C ++中十六进制的数据类型是什么？例如，我目前有一个用于ffffff的字符串，但是我需要将其放入函数调用的0xffffff中。基本上，我的代码会生成一个十六进制的随机数字作为一个整数，然后将这些整数转换为十六进制代码。然后，我将这些字符串附加在一起以创建一个十六进制字符串，但是现在我仍然停留在如何将其转换为light_matrix.wr_pix（）函数调用的0xffffff格式的问题上。这是我的代码：
#include "de10_baseline.h"
#include "ws2812_core.h"
#include "stdlib.h"
#include "time.h"
#include <string>
std::string getHex(int digit){
std::string hex_digit;
switch(digit){
case 0:
hex_digit = "0";
case 1:
hex_digit = "1";
case 2:
hex_digit = "2";
case 3:
hex_digit = "3";
case 4:
hex_digit = "4";
case 5:
hex_digit = "5";
case 6:
hex_digit = "6";
case 7:
hex_digit = "7";
case 8:
hex_digit = "8";
case 9:
hex_digit = "9";
case 10:
hex_digit = "a";
case 11:
hex_digit = "b";
case 12:
hex_digit = "c";
case 13:
hex_digit = "d";
case 14:
hex_digit = "e";
case 15:
hex_digit = "f";
default:
hex_digit="g";
}
return hex_digit;
}
int main() {
//get i and j of button press
// i-1, j-1
// i-1 , j
// i-1 , j +1
// i , j-1
// i , j+1
// i+1, j-1
// i+1, j
// i+1, j +1
//assign i to x, j to y
int i=1;
int j=1;
int c;
int k;
light_matrix.wr_pix(0,0,0x000000); //green
light_matrix.wr_pix(0,1,0x000000); //green
light_matrix.wr_pix(0,2,0x000000); //green
light_matrix.wr_pix(1,0,0x000000); //blue
light_matrix.wr_pix(1,1,0x000000); //blue
light_matrix.wr_pix(1,2,0x000000); //blue
light_matrix.wr_pix(2,0,0x000000); //green
light_matrix.wr_pix(2,1,0x000000); //green
light_matrix.wr_pix(2,2,0x000000); //green
/* initialize random seed: */
srand(time(NULL));
while(1){
int hex1 = rand() % 15;
int hex2 = rand() % 15;
int hex3 = rand() % 15;
int hex4 = rand() % 15;
int hex5 = rand() % 15;
int hex6 = rand() % 15;
std::string hex1_s = std::to_string(hex1);
std::string hex2_s = std::to_string(hex2);
std::string hex3_s = std::to_string(hex3);
std::string hex4_s = std::to_string(hex4);
std::string hex5_s = std::to_string(hex5);
std::string hex6_s = std::to_string(hex6);
std::string hex_string = hex1_s + hex2_s + hex3_s + hex4_s + hex5_s + hex6_s;
if(btn.read(0)){
for(c = 0; c < 8; c++){
for(k = 0; k < 12; k++){
if( (c==i-1 || c==i || c == i+1 ) && (k==j-1|| k==j || k == j+1) && (c >= 0) && (k >=0) && (!(c==i && k==j))){
light_matrix.wr_pix(c,k,0x0000ff);
sleep_ms(100);
light_matrix.wr_pix(c,k,0x000000);
}
}
}
}
}
}//main