用发write、fread将一张随意图片修改成德国国旗

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<unistd.h>
int main(int argc, char *argv[])
{FILE* fp=fopen("./122.bmp","r");int w = 0,h = 0;fseek(fp,18,SEEK_SET);fread(&w,4,1,fp);fread(&h,4,1,fp);printf("图像尺寸为:%d * %d\n",w,h);fclose(fp);fp = fopen("./122.bmp","r+");fseek(fp,54,SEEK_SET);unsigned char yel[3] = {0,255,255};unsigned char red[3] = {0,0,255};unsigned char bla[3] = {0,0,0};for(int i=0;i<w;i++){for(int j=0;j<(h/3);j++){fwrite(yel,3,1,fp);}}for(int i=0;i<w;i++){for(int j=(h/3);j<(h*2/3);j++){fwrite(red,3,1,fp);}}for(int i=0;i<w;i++){for(int j=(h*2/3);j<h;j++){fwrite(bla,3,1,fp);}}fclose(fp);	return 0;
}

使用getch函数编写一个专门用来输入密码的函数，要求输入密码时显示*号输入回车，密码输入结束

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<termios.h>
#include<sys/types.h>
#include<assert.h>
int getch(){int c=0;struct termios org_opts, new_opts;int res=0;res=tcgetattr(STDIN_FILENO, &org_opts);assert(res==0);new_opts = org_opts;new_opts.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHOK | ECHONL | ECHOPRT | ECHOKE | ICRNL);tcsetattr(STDIN_FILENO, TCSANOW, &new_opts);c=getchar();res=tcsetattr(STDIN_FILENO, TCSANOW, &org_opts);assert(res==0);return c;
}
void sec(char *sec,int len)
{int i=0;while(i<len-1){char c=getch();if(c==10){break;}printf("*");sec[i++]=c;}sec[i]='\0';printf("\n");
}
int main(int argc, char *argv[])
{char arr[10];sec(arr,10);printf("输入密码为:%s\n",sec);return 0;
}