帮帮我用read函数一个简单的读取文本a.txt中的数据，保存到以下变量中//例子//
include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
fd = open("a.txt", O_WRONLY|O_CREAT|O_TRUNC);
if(fd==-1)perror(""),exit(-1);
char buf[100] = {};
sprintf(buf, "%d", id);
write(fd, buf, strlen(buf));
write(fd, "\t", 1);
write(fd, name, strlen(name));
write(fd, "\t", 1);
memset(buf, 0, sizeof(buf));
sprintf(buf, "%d", age);
write(fd, buf, strlen(buf));
write(fd, "\t", 1);
memset(buf, 0, sizeof(buf));
sprintf(buf, "%g", salary);
write(fd, buf, strlen(buf));
close(fd);
//----读取文本a.txt中的数据，保存到以下变量中-----
int rid2;
char rname2[20];
int rage2;
double rsalary2;
/*
// atoi
// atof
*/
}
[解决办法]
這麼簡單不需要大神出手，我來吧！
樓主結貼要及時哦~
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <fcntl.h>#include <unistd.h>#include <sys/types.h>int main(){ int fd = open("a.txt", O_WRONLY | O_CREAT | O_TRUNC); if (fd == -1) perror(""), exit(-1); char buf[100] = {0}; /* define variables first */ int id = 3; char *name = "XX不哭，站起來擼！"; int age = 23; double salary = 8700.29; /* Chinese Yuan */ sprintf(buf, "%d\t%s\t%d\t%g", id, name, age, salary); write(fd, buf, sizeof(buf)); close(fd); /* 變量不定義在開始是C99支持的寫法，如果用gcc編譯器記得加“-std=c99”*/ int rid2; char rname2[20]; int rage2; double rsalary2; char id2[20], age2[20], salary2[20]; if((fd = open("a.txt", O_RDONLY)) < 0) { perror(""); exit(1); } read(fd, buf, sizeof(buf)); sscanf(buf, "%s\t%s\t%s\t%s", id2, rname2, age2, salary2); close(fd); rid2 = atoi(id2); rage2 = atoi(age2); rsalary2 = atof(salary2); printf("rid2: %d\n" "rname2: %s\n" "rage2: %d\n" "rsalary2: %g\n", rid2, rname2, rage2, rsalary2);}