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


int main(){
    system("cls");

    char chuoi1[50];
    char chuoi2[50];
    char chuoi3[50];

    printf("Nhap ao chuoi1: ");
    gets(chuoi1);
    printf("Nhap ao chuoi2: ");
    gets(chuoi2);
    
    strcpy(chuoi3, chuoi1);
    strcat(chuoi3, chuoi2);

    printf("Ket qua sau khi noi chuoi la : %s", chuoi3);
    return 0;
}
Success #stdin #stdout #stderr 0s 5320KB
stdin
Standard input is empty
stdout
Nhap ao chuoi1: Nhap ao chuoi2: Ket qua sau khi noi chuoi la : �oL�
stderr
sh: 1: cls: not found