feat: user program added

Makefile

@@ -181,6 +181,7 @@ UPROGS=\
 	_usertests\
 	_wc\
 	_zombie\
+	_sdvar\
 
 fs.img: mkfs README $(UPROGS)
 	./mkfs fs.img README $(UPROGS)
@@ -251,6 +252,7 @@ EXTRA=\
 	mkfs.c ulib.c user.h cat.c echo.c forktest.c grep.c kill.c\
 	ln.c ls.c mkdir.c rm.c stressfs.c usertests.c wc.c zombie.c\
 	printf.c umalloc.c\
+	sdvar.c\
 	README dot-bochsrc *.pl toc.* runoff runoff1 runoff.list\
 	.gdbinit.tmpl gdbutil\
 

sdvar.c

@@ -0,0 +1,76 @@
+#define MAX_NUMBERS 7
+
+float calculateSD(double data[],int n) {
+    float sum = 0.0, mean, SD = 0.0;
+    int i;
+    for (i = 0; i < n; ++i) {
+        sum += data[i];
+    }
+    mean = sum / n;
+    for (i = 0; i < n; ++i) {
+        SD += pow(data[i] - mean, 2);
+    }
+    return sqrt(SD / n);
+}
+float Variance(double a[], int n)
+{
+    int sum = 0;
+    for (int i = 0; i < n; i++)
+        sum += a[i];
+    double mean = (double)sum / (double)n;
+
+    double sqDiff = 0;
+    for (int i = 0; i < n; i++) 
+        sqDiff += (a[i] - mean) * 
+                  (a[i] - mean);
+    return sqDiff / n;
+}
+int main() {
+    double numbers[MAX_NUMBERS];
+    int count = 0;
+    double sum = 0.0;
+
+    // Read input numbers
+    printf("Enter up to %d numbers (separated by spaces):\n", MAX_NUMBERS);
+    while (count < MAX_NUMBERS && scanf("%lf", &numbers[count]) == 1) {
+        sum += numbers[count];
+        count++;
+    }
+
+    // Calculate average
+    int average = sum / count;
+
+    // Calculate standard deviation and variance
+    double standard_deviation_array[MAX_NUMBERS];
+    double variance_array[MAX_NUMBERS];
+    int sda_temp = 0;
+    int va_temp = 0;
+    for(int i=0; i<count; i++)
+    {
+        if(numbers[i] <= average)
+        {
+
+            standard_deviation_array[sda_temp] = numbers[i];
+            sda_temp++;
+        }
+        else
+        {
+            variance_array[va_temp] = numbers[i];
+            va_temp++;
+        }
+    }
+    int standard_deviation = calculateSD(standard_deviation_array, sda_temp);
+    int variance = Variance(variance_array, va_temp);
+    // Save results to a file
+    FILE *file = fopen("txt.result_sdvar", "w");
+    if (file != NULL) {
+        fprintf(file, "%d\n", average);
+        fprintf(file, "%d\n", standard_deviation);
+        fprintf(file, "%d\n", variance);
+        fclose(file);
+    } else {
+        printf("Error opening file for writing.\n");
+    }
+
+    return 0;
+}