void main(){
int C = 40;
int size = 4;
int V[] = {1,5,10,25,50};
int O[] = {0,0,0,0};
for (int C = 2000; C<=2300; C++){
changedp(O,V,C, size);
}
}
//for each block of input in the argv[1] file, calls the change function for the values listed. Results are printed in filename+change.txt
int main(int argc, char* argv[]){
FILE* f_in;//the file read
FILE* f_out;//the file written to
char* fn_in = argv[1];//the name of the file to be read
char* fn_out;//the name of the file to be written to
char* f_text;//the text from the file
long f_size;//size of file
int V[1000];//array of coin values, max size 1000
int v_count = 0;//number of coins
int A;//the amount that needs to be made into change
char* token;//section of input file from strtok
char* token2;//section of input file from strtok
char* token_ptr;//used for strtok_r
int** DP_table;//table to hold values for dpChange
int i, j;
clock_t begin, end;
double run;//used to measure time
//checking if user has provided filename
if(argc != 2){
printf("Error: incorrect number of arguments\n");
printf("Usage: changedp [filename]\n\n");
exit(0);
}
//opening input file
f_in = fopen(fn_in, "r");
if(f_in == NULL) {
printf("Error: cannot open input file\n");
}
//stripping .txt from input filename and adding change.txt, then open output file
fn_out = argv[1];
strtok(fn_out, ".");
strcat(fn_out, "change.txt");
f_out = fopen(fn_out, "w+");
if(f_out == NULL) {
printf("Error: cannot open output file\n");
}
//getting text from file
fseek(f_in, 0, SEEK_END);
f_size = ftell(f_in);
rewind(f_in);
f_text = malloc(f_size + 1);
fread(f_text, f_size, 1, f_in);
fclose(f_in);
begin = clock();//starting timer
fprintf(f_out, "Changedp:\n");
token = strtok_r(f_text, "\n\r", &token_ptr);
//run while there are blocks to be read
while( token != NULL )
{
//getting V
v_count = 0;
token2 = strtok(token, ", []\n\r");
while(token2!= NULL) {//adding all values to V
V[v_count] = atoi(token2);
v_count++;
token2 = strtok(NULL, ", []\n\r");
}
token = strtok_r(NULL, "\n\r", &token_ptr);//getting A
A = atoi(token);
//malloc for DP table
DP_table = (int**)malloc((1+A)*sizeof(int*));
for(i = 0; i < A+1; i++) {
DP_table[i] = (int*)malloc(v_count*sizeof(int));
for(j = 0; j < v_count; j++) {
DP_table[i][j] = 0;
}
}
//printf("RESULT SUM: %i\n", sumarray(changedp(V, v_count, A, DP_table), v_count));//remove later LAUREN
Ctofile(f_out, changedp(V, v_count, A, DP_table), v_count);
//free DP_table
for(i = 0; i < A+1; i++) {
free(DP_table[i]);
}
free(DP_table);
token = strtok_r(NULL, "\n\r", &token_ptr);
}
fclose(f_out);
end = clock();//ending timer
run = (double)(end - begin) / CLOCKS_PER_SEC;
printf("Running Time: %.2f\n", run);
return 0;
}
//takes an array of values V, and returns the number for each of these to use to make A in corresponding array C
int* changedp(int* V, int V_size, int A, int* DP_table[V_size]) {
int i, j;
int newA;//A with value in V subtracted
int* newC = malloc(V_size*sizeof(int));//values calculated using newA + 1 coin
int* minC = malloc(V_size*sizeof(int));//the C with the fewest number of coins
if(sumarray(DP_table[A], V_size) != 0) {//if DP_table has already been set for this A, return it
return DP_table[A];
}
for(i = 0; i < V_size; i++) {
if(V[i] == A) {//if A is one of the values in V, return minC with that as the only coin
//setting all values in minC to 0, excluding minC[i]
for(j = 0; j < V_size; j++) {
minC[j] = 0;
}
minC[i] = 1;
DP_table[A][i] = 1;//copying to DP table
printf("Setting Base Table for %i \n", A);
for(j = 0; j < V_size;j++) {
printf("DP_table[%i][%i] = %i\n", A, j, DP_table[A][j]);
}
return minC;
}
}
for(i = 0; i < V_size; i++) {
if(V[i] > A) {//if the coin is larger than the amount we're checking, return minC
memcpy(DP_table[A], minC, V_size*sizeof(int));//copying minC to DP_table
printf("Setting Table for %i when V[i] > A\n", A);
for(j = 0; j < V_size;j++) {
printf("DP_table[%i][%i] = %i\n", A, j, DP_table[A][j]);
}
return minC;
}
newA = A - V[i];
memcpy(newC, changedp(V, V_size, newA, DP_table), V_size*sizeof(int));//getting change for sub amount new A
newC[i] += 1;//adding coin to C
if(i == 0) {//if this is the first newC found, it's automatically minC
memcpy(minC, newC, V_size*sizeof(int));
}
else {//comparing previous best C to new one
if(sumarray(newC, V_size) < sumarray(minC, V_size)) {//if the new C has fewer coins than minC, it becomes minC
memcpy(minC, newC, V_size*sizeof(int));
}
}
}
memcpy(DP_table[A], minC, V_size*sizeof(int));
printf("nSetting Table for %i \n", A);
for(j = 0; j < V_size;j++) {
printf("DP_table[%i][%i] = %i\n", A, j, DP_table[A][j]);
}
return DP_table[A];
}
int main(){
FILE *fp, *fp2;
char discard;
char str[100]; //assume each line has less than 100 characters
int number_lines;
int i, j;
int *V = malloc(100 * sizeof(int)); //assume each line has less than 100 numbers
int *C = malloc(100 * sizeof(int)); //assume each line has less than 100 numbers
int A;
int size;
int minimum;
fp = fopen ("Coin.txt", "r");
for (i = 0; i < 100; i++){
if (feof(fp)) //end of file
break;
fgets(str, 100, fp);
}
number_lines = i;
rewind(fp);
fp2 = fopen ("Coinchange.txt", "w");
for (i = 0; i < number_lines / 2; i++){
discard = fgetc(fp); //discard [
for (j = 0; j < 100; j++){
fscanf(fp, "%d%c ", &V[j], &discard);
if (discard != ',') //end of line
break;
}
size = j + 1;
fscanf(fp, "%d", &A);
discard = fgetc(fp); //discard newline character
//start changeslow
int* array = malloc(100 * sizeof(int));
array = changeslow(V, size, A);
int summ = 0;
for (j = 0; j < size; j++){
//printf("%d ", array[j]);
summ += array[j];
}
fprintf(fp2, "[");
for (j = 0; j < size - 1; j++){
fprintf(fp2, "%d, ", array[j]);
}
fprintf(fp2, "%d]\n", array[size - 1]);
fprintf(fp2, "%d\n", summ);
//end changeslow
//start changechangegreedy
for (j = 0; j < 100; j++){
C[j] = 0; //initiate to zero
}
minimum = changegreedy(V, C, size, A);
fprintf(fp2, "[");
for (j = 0; j < size - 1; j++){
fprintf(fp2, "%d, ", C[j]);
}
fprintf(fp2, "%d]\n", C[size - 1]);
fprintf(fp2, "%d\n", minimum);
//end changechangegreedy
//start changedp
for (j = 0; j < 100; j++){
C[j] = 0; //initiate to zero
}
minimum = changedp(V, C, size, A);
fprintf(fp2, "[");
for (j = 0; j < size - 1; j++){
fprintf(fp2, "%d, ", C[j]);
}
fprintf(fp2, "%d]\n", C[size - 1]);
fprintf(fp2, "%d\n", minimum);
//end changedp
fprintf(fp2, "\n");
}
fclose(fp);
fclose(fp2);
printf("See Coinchange.txt for results.\n");
return 0;
}
