Check out example codes for "first fit algorithm". It will help you in understanding the concepts better.

Code Example 1

// Function to allocate memory to  
// blocks as per First fit algorithm 
void firstFit(int blockSize[], int m,  
              int processSize[], int n) 
{ 
    // Stores block id of the  
    // block allocated to a process 
    int allocation[n]; 
  
    // Initially no block is assigned to any process 
    memset(allocation, -1, sizeof(allocation)); 
  
    // pick each process and find suitable blocks 
    // according to its size ad assign to it 
    for (int i = 0; i < n; i++) 
    { 
        for (int j = 0; j < m; j++) 
        { 
            if (blockSize[j] >= processSize[i]) 
            { 
                // allocate block j to p[i] process 
                allocation[i] = j; 
  
                // Reduce available memory in this block. 
                blockSize[j] -= processSize[i]; 
  
                break; 
            } 
        } 
    } 
  
    cout << "\nProcess No.\tProcess Size\tBlock no.\n"; 
    for (int i = 0; i < n; i++) 
    { 
        cout << " " << i+1 << "\t\t" 
             << processSize[i] << "\t\t"; 
        if (allocation[i] != -1) 
            cout << allocation[i] + 1; 
        else
            cout << "Not Allocated"; 
        cout << endl; 
    } 
}

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