?? add2.c
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#include "apue.h"intmain(void){ int n, int1, int2; char line[MAXLINE]; while ((n = read(STDIN_FILENO, line, MAXLINE)) > 0) { line[n] = 0; /* null terminate */ if (sscanf(line, "%d%d", &int1, &int2) == 2) { sprintf(line, "%d\n", int1 + int2); n = strlen(line); if (write(STDOUT_FILENO, line, n) != n) err_sys("write error"); } else { if (write(STDOUT_FILENO, "invalid args\n", 13) != 13) err_sys("write error"); } } exit(0);}?? 快捷鍵說(shuō)明
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