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To allocate space for a struct using malloc, follow these steps:

1. Define your struct and its members. For example:

typedef struct {
    int id;
    char name[20];
    float salary;
} Employee;

1. Call malloc and pass in the size of the struct:

Employee *emp = (Employee *)malloc(sizeof(Employee));

1. Check if the memory allocation was successful:

if (emp == NULL) {
    printf("Memory allocation failed");
    exit(1);
}

1. Access the struct members and assign values:

emp->id = 1001;
strcpy(emp->name, "John");
emp->salary = 50000.00;

1. When done using the struct, free the allocated memory:

free(emp);