Someone could help me, I want you to concatenate the first 2 characters of each of these 3 strings, I attach my program

Question

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

int main() {
char cadena1[20] ,cadena2[20], cadena3[20];

printf("Introduce la primer cadena 1>");
scanf("%s",cadena1);

printf("Introduce la segunda cadena 2>");
scanf("%s",cadena2);  

printf("Introduce la tercera cadena 3> ");
scanf("%s",cadena3);

printf("\nCadenas concatenadas -> %s\n",strcat(cadena1,cadena2,)==0);
printf("\ncontenido de cadena1:");
puts (cadena1);
printf("\ncontenido de cadena2:");
puts (cadena2);

printf("\nCadenas concatenadas -> %s\n",strcat(cadena1,cadena3)==0);
printf("\ncontenido de cadena1:");
puts (cadena1);
printf("\ncontenido de cadena3:");
puts (cadena3);
return 0;
}

Answer 1

You can use 2D char array as <cadenas> and use loop to read input, copy characters.

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

#define INPUTS 3 // number of string
#define COPIES 2 // number of char to be copied

int main()
{
const char *legend[INPUTS] = { "primer", "segunda", "tercera" };
char cadenas[INPUTS][20], res[7] = { 0 };

for (size_t i = 0; i < INPUTS; i++)
{
printf("Introduce la %s cadena %lu > ", legend[i], i + 1);
fflush(stdout);
scanf("%s", cadenas[i]);
puts(cadenas[i]); // for Code Playground
strncat(res, cadenas[i], COPIES);
}
puts(res); // result

return 0;
}

Answer 2

Thanks a lot

Answer 3

I think you don't need strcat() for that. Just:

char result[] = {cadena1[0], cadena1[1], cadena2[0], cadena2[1], cadena3[0], cadena3[1], '\0'};

puts(result);