commments for 6 and 7. 9 works, 8 does not

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "ctype.h": "c"
+    }
+}

Assignment 6/abc.c

@@ -15,17 +15,17 @@ static float discriminant(){
 
 void abc(){
     float D = discriminant();
-        if (D>0){
-        x1real = ((-b+sqrt(D))/(2.0*a));
+        if (D>0){   /*Calculate x1real and x2real if D>0*/
+        x1real = ((-b+sqrt(D))/(2.0*a)); /*Use 2.0 instead of 2 so a float is calculated instead of an int*/
         x2real = ((-b-sqrt(D))/(2.0*a));
         ximag = 0;
     }
-    else if(D<0){
+    else if(D<0){   /*Calculate x1real and ximag if D<0*/
         x1real = -b/(2.0*a);
         x2real = x1real;
         ximag = (sqrt(-D)/(2.0*a));
     }
-    else{
+    else{   /*Calculate x1real if D=0*/
         x1real = -b/(2.0*a);
         x2real = x1real;
         ximag = 0;

Assignment 7/main.c

@@ -9,23 +9,23 @@
 #include<math.h>
 
 int main(){
-    int m,n,i,j,c;
-    double price[100] = {0};
-    int matrix[100][100];
-    scanf("%d",&n);
-    for(i = 0; i<n; i++){
-        scanf("%lf", &price[i]);
-        }
-    scanf("%d",&m);
-    for(j = 0; j<m; j++){
-        for (c = 0; c < n; c++){
-        scanf("%d",&matrix[c][j]);
+    int m,n,i,j,c;  /*Declare Variables*/
+    double price[100];    /*Declare array price*/
+    int matrix[100][100];   /*Declare array matrix*/ 
+    scanf("%d",&n);     /*Get amount of items*/
+    for(i = 0; i<n; i++){   /*Loop to get price for every item and store them into array price*/
+        scanf("%lf", &price[i]); 
+    }
+    scanf("%d",&m);     /*Get amount of customers*/
+    for(j = 0; j<m; j++){   /*Loop the following code for every custromer*/
+        for (c = 0; c < n; c++){ /*Loop to get amount of every item and store amount of customers and amount of items they buy in matrix*/
+            scanf("%d",&matrix[c][j]);
         } 
     }
-    for (j = 0; j<m; j++){
+    for (j = 0; j<m; j++){  /*Loop the following code for every custromer*/
         float total = 0;
-        for(c = 0; c < n; c++){
-        total += matrix[c][j]*price[c];
+        for(c = 0; c < n; c++){     /*Calculating total*/
+            total += matrix[c][j]*price[c];
         }
         printf("%.2f\n", total);
     }

Assignment 8/main.c

@@ -0,0 +1,60 @@
+/*
+ * Student: S.K. Soekhlal
+ * Number: 4860632
+ * Assignment: 4.6
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+void swap(double *p, double *q){    /*Swapping*/
+        double temp;
+        temp = *p;
+        *p = *q;
+        *q = temp;
+    }
+
+void sort(double a[], double n){    /*Bubble Sort*/
+    int i,j;
+
+    for (i = 0; i < n - 1; i++){
+        for (j = n - 1; j > i; --j){
+            if (a[j-1] > a[j]){
+                swap(&a[j-1], &a[j]);
+            }
+        }
+    }
+}
+
+int main(){
+    int dim, num;
+    int i,j;
+    double **w;
+    double *length, temp;
+
+    scanf ("%d %d", &dim, &num);    /*read N and M*/
+    w = calloc (num, sizeof (double *)); /*allocate array of M pointers*/
+    for (i = 0; i < num; i++){
+        /*allocate space for N dimensional vector*/
+        w[i] = calloc (dim, sizeof (double));
+        /*read the vector*/
+        for (j = 0; j < dim; j++){
+            scanf ("%le", &w[i][j]);
+        }
+    }
+
+    //length = calloc (num, sizeof (double));
+    for (i = 0; i < num; i++){
+        temp = 0;
+        for (j = 0;j < dim; j++){
+            temp = temp + pow(w[i][j], 2);
+            length[i] = sqrt(temp);
+        }
+    }
+    sort(length, num);
+    for (i = 0; i < num; i++){
+        printf("length = %e \n", length[i]);
+    }
+    return 0;
+}

Assignment 9/main.c

@@ -0,0 +1,50 @@
+/*
+ * Student: S.K. Soekhlal
+ * Number: 4860632
+ * Assignment: 4.8
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+char str[1024];
+int slen, wlen, count, i, j;
+
+void next(){
+    while(isspace(str[i]) == 0 && ispunct(str[i] == 0 && str[i] != '\0'))
+    i++;
+}
+
+int main(int argc, char **argv){
+    gets(str);
+    slen = strlen(str);
+    printf("%d\n", slen);
+    wlen = strlen(argv[1]);
+    printf("%d\n", wlen);
+    for (i = 0; i < slen; i++){
+    }
+    i = j = count = 0;
+    while(i < slen){
+        if (str[i] == *argv[1]){
+            for (j = 0; j < wlen; j++){
+                if(str[i+j] != argv[1][j]){
+                    next();
+                    break;
+                }
+            }
+            if (j == wlen){
+                if (isspace(str[i+j]) || ispunct(str[i+j]) || str[i+j] == '\0'){
+                    count++;
+                    i +=j;
+                }
+            }
+        }
+        else{
+            next();
+        }
+        i++;
+    }
+    printf("%d\n", count);
+    return 0;
+}