NumCarpetas.cpp

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

#define SIZE 100

int main(){

    char carpetas[SIZE][SIZE],d;
    int num,sum,cont = 0,piv = 1;

    printf("Ingrese la cantidad de carpetas: ");
    scanf("%d",&num);
    while((d = getc(stdin)) != '\n' && d != EOF);

    for(int i = 0; i < num; i++)
	{
        printf("Nombre de la carpeta %d: ", i + 1);
        gets(carpetas[i]);
    }


    printf("Numero a sumar: ");
    scanf("%d",&sum);
    while((d = getc(stdin)) != '\n' && d != EOF);

   for(int i = 0; i < num; i++)
   {
        cont = 0;
        piv = 1;
        int largo = strlen(carpetas[i]) - 1;
        for(int j = largo;j >= 0; j--)
		{
            if(carpetas[i][j] >= '0' && carpetas[i][j] <= '9')
			{
                cont += (carpetas[i][j] - '0') * piv;
            }
            piv *= 10;
        }
        cont += sum;
        for(int j = 0; j <= largo; j++){
            if(carpetas[i][j] >= '0' && carpetas[i][j] <= '9') continue;
            printf("%c", carpetas[i][j]);
        }
        printf("%d \n", cont);
    }

return 0;
}