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Arthurlink
Asked: 2022-06-25 08:50:42 +0800 CST 2022-06-25 08:50:42 +0800 CST

How to shift position a string in a structure in C?

  • 772

I am applying the queue concept in a program, the program can log data, display it and delete it. This is the structure I use:

struct personal {
  char nombre [40];
  char apellido [40]; 
  int  edad; 
  float  sueldo; 
}  ;

    int j,i =0; //indices
    int opc=0;
    char k [3];
    personal cliente [100];

My problem is at the time of deleting the data, I want to delete the data from the starting position (0) and then shift back the remaining data:

void elimina(){
    do{     
        system("cls");
        printf("\n EL CLIENTE A ELIMINAR ES :  \n ");
        printf("\n nombre  : %s \n ",cliente[0].nombre );
        printf("\n apellido: %s \n ",cliente[0].apellido );
        printf("\n edad    : %d \n ",cliente[0].edad ); 
        printf("\n sueldo  : %f \n ",cliente[0].sueldo );
        for ( j = 0; j < i; j++)
        {
            cliente[j].nombre= cliente[j+1].nombre; //Intento fallido
            cliente[j].apellido= cliente[j+1].apellido; //Intento fallido
            cliente[j].edad = cliente[j+1].edad;
            cliente[j].sueldo = cliente[j+1].sueldo ;
        }
        



        printf("\n Desea elimnar otro cliente: [si=1/no=2] \n");
        scanf("%d" ,&opc);
        i--;
        getch();
    }while (opc==1 && i>0);
    
    

}

The variable cliente[j].edadand cliente[j].sueldoare moved correctly, my problem is with string variables, I don't know how to move them. There I tried, but it does not work correctly.

array

1 Answers

  1. Best Answer

    There are much simpler ways to do it. Since you are using a struct, the size of your data is known and fixed. Therefore, we can perfectly use the function memcpy( )(in the header <string.h>). This function allows us to move an entire instance of personal, without having to copy member by member:

    void elimina( ) {
    do{     
        system("cls");
        printf("\n EL CLIENTE A ELIMINAR ES :  \n ");
        printf("\n nombre  : %s \n ",cliente[0].nombre );
        printf("\n apellido: %s \n ",cliente[0].apellido );
        printf("\n edad    : %d \n ",cliente[0].edad ); 
        printf("\n sueldo  : %f \n ",cliente[0].sueldo );
        for ( j = 0; j < i; j++)
        {
            memcpy( &( cliente[j] ), &( cliente[j + 1] ), sizeof( struct personal ) );
        }

        printf("\n Desea elimnar otro cliente: [si=1/no=2] \n");
        scanf("%d" ,&opc);
        i--;
        getch();
    }while (opc==1 && i>0);
}
    • 3