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Programación para sistemas (Todos los grados)

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Dada la siguiente estructura, ¿cómo pedirías memoria dinámica para esta estructura y asignar el valor 5 al campo "a"?

typedef struct {

int a;

int b;

} Coordenada;

Coordenada *p = malloc(sizeof(Coordenada)); p.a = 5;

Coordenada *p = malloc(2 * sizeof(Coordenada)); p->a = 5;

Coordenada *p = (Coordenada*) malloc(sizeof(int)); p->a = 5;

Coordenada *p = (Coordenada*) malloc(sizeof(Coordenada)); p->a = 5;

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Sea el siguiente programa en C:

int main (void) {

int A = 5, B = 2, C = 7, *P1, *P2;

P1 = &A;

P2 = &C;

*P1 = *P2 - B;

printf("VALOR DE A %d B %d C %d", A, B, C);

return 0;

}

¿Qué salida produce este programa?

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