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How to send a string through a pipe

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> int main(int argc, char* argv[]) { int fd[2]; if (pipe(fd) == -1) { return 1; } int pid = fork(); if (pid == -1) { return 2; } if (pid == 0) { // Child process close(fd[0]); char str[200]; printf("Input string: "); fgets(str, 200, stdin); str[strlen(str) - 1] = '\0'; int n = strlen(str) + 1; if (write(fd[1], &n, sizeof(int)) < 0) { return 3; } printf("Sent n = %d\n", n); if (write(fd[1], &str, sizeof(char) * n) < 0) { return 4; } printf("Sent string\n"); close(fd[1]); } else { close(fd[1]); char str[200]; int n; if (read(fd[0], &n, sizeof(int)) < 0) { return 5; } printf("Received n = %d\n", n); if (read(fd[0], &str, sizeof(int) * n) < 0) { return 6; } printf("Received string %s\n", str); close(fd[0]); wait(NULL); } return 0; }