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WORST CASE
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WORST CASE
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#include <stdio.h>
struct memory_block {
int start_address;
int end_address;
int size;
int allocated; // 0 means not allocated, 1 means allocated
};
int main() {
int num_blocks, num_processes;
// Prompt user to enter the number of memory blocks
printf("Enter the number of memory blocks: ");
scanf("%d", &num_blocks);
struct memory_block blocks[num_blocks];
// Ask user to enter the size of each memory block
for (int i = 0; i < num_blocks; i++) {
printf("Enter the size of memory block %d: ", i + 1);
scanf("%d", &blocks[i].size);
blocks[i].start_address = i == 0 ? 0 : blocks[i - 1].end_address + 1; // calculate start and end addresses
blocks[i].end_address = blocks[i].start_address + blocks[i].size - 1;
blocks[i].allocated = 0; // initialize the memory block as not allocated
}
// Prompt user to enter the number of processes
printf("Enter the number of processes: ");
scanf("%d", &num_processes);
// Ask user to enter the size of each process and allocate memory using the worst fit algorithm
printf("| Process No. | Process Size | Block No. | Block Size | Fragmentation |\n");
printf("|-------------|---------------|-----------|------------|--------------|\n");
for (int i = 1; i <= num_processes; i++) {
int process_size, block_allocated = -1;
int max_frag = -1;
printf("Enter the size of process %d: ", i);
scanf("%d", &process_size);
for (int j = 0; j < num_blocks; j++) {
if (blocks[j].allocated == 0 && blocks[j].size >= process_size) {
if (max_frag == -1 || blocks[j].size - process_size > max_frag) {
max_frag = blocks[j].size - process_size;
block_allocated = j;
}
}
}
if (block_allocated != -1) {
blocks[block_allocated].allocated = 1;
printf("| %d | %-14d | %d | %-10d | %-13d |\n", i, process_size, block_allocated + 1, blocks[block_allocated].size, blocks[block_allocated].size - process_size);
} else {
printf("| %d | %-14d | %-9s | %-10s | %-13s |\n", i, process_size, "Not found", "-", "-");
}
}
return 0;
}