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1. 使用strcat进行字符串拼接

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
    char *firstName = "Theo";
    char *lastName = "Tsao";
    char *name = (char *) malloc(strlen(firstName) + strlen(lastName));
    strcpy(name, firstName);
    strcat(name, lastName);
    printf("%s\n", name);
    return 0;
}

2. 使用sprintf进行字符串拼接

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
    char *firstName = "Theo";
    char *lastName = "Tsao";
    char *name = (char *) malloc(strlen(firstName) + strlen(lastName));
    sprintf(name, "%s%s", firstName, lastName);
    printf("%s\n", name);
    return 0;
}

C语言学习笔记之字符串拼接的2种方法——strcat、sprintf

原文：https://www.cnblogs.com/metaphors/p/9409153.html