How to change a variable in a calling function from a called function? [duplicate]

by

To change the value of x from within a function, have try() take a pointer to the variable and change it there.

e.g.,

void try(int *x)
{
    *x = 11;
}

int main()
{
    int x = 10;
    try(&x);
    printf("%d",x);
    return 0;
}

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