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Exercise 7

Exercise 7

Task 0 initializes a variable to a given value,then modifies the variable (for example, by calculating the square of its value) and finally broadcasts it to all the others tasks.

`HINTS:`
	C
MPI_BCAST	`int MPI_Bcast(void* buffer, int count, MPI_Datatype datatype, int root, MPI_Comm comm)`
MPI_INIT	`int MPI_Init(int argc, char **argv)`
MPI_COMM_SIZE	`int MPI_Comm_size(MPI_Comm comm, int *size)`
MPI_COMM_RANK	`int MPI_Comm_rank(MPI_Comm comm, int *rank)`
MPI_FINALIZE	`int MPI_Finalize(void)`
	FORTRAN
MPI_BCAST	`MPI_BCAST(BUFFER, COUNT, DATATYPE, ROOT, COMM, IERROR) <type> BUFFER(*) INTEGER COUNT, DATATYPE, ROOT, COMM, IERROR`
MPI_INIT	`MPI_INIT(IERROR) INTEGER IERROR`
MPI_COMM_SIZE	`MPI_COMM_SIZE(COMM, SIZE, IERROR) INTEGER COMM, SIZE, IERROR`
MPI_COMM_RANK	`MPI_COMM_RANK(COMM, RANK, IERROR) INTEGER COMM, RANK, IERROR`
MPI_FINALIZE	`MPI_FINALIZE(IERROR) INTEGER IERROR`