add: 20_miscellaneous 01

Author: webwithaman

20_miscellaneous_programs/get_input.exe

@@ -0,0 +1,124 @@
+#include <stdio.h>
+#include <conio.h>
+#include <math.h>
+#include <string.h>
+
+double getOnlyRealNumber();
+double stringToDouble(char *);
+
+long long int getOnlyInteger();
+long long int stringToInt(char *);
+
+int main()
+{
+    // Get Only Real Number
+    printf("\nEnter A Real Number (Number With Decimal Point) => ");
+    printf("\nEntered Real Number %lf", getOnlyRealNumber());
+
+    // Get Only Integer
+    printf("\n\nEnter An Integer => ");
+    printf("\nEntered Integer => %lld", getOnlyInteger());
+
+    getch();
+    return 0;
+}
+
+double getOnlyRealNumber()
+{
+    char str[30];
+    int i = 0;
+    while (1)
+    {
+        char ch = getch();
+        if (ch == ' ' || ch == 13)
+            break;
+        else if ((ch >= '0' && ch <= '9' || ch == '.') || ch == '-' && i == 0)
+        {
+            putch(ch);
+            str[i] = ch;
+            i++;
+        }
+        else if (ch == 8 && i > 0)
+        {
+            i--;
+            putch('\b');
+            putch(' ');
+            putch('\b');
+        }
+    }
+    str[i] = 0;
+    return stringToDouble(str);
+}
+
+double stringToDouble(char *str)
+{
+    long long int integeralPart = 0, decimalPart = 0;
+    int i = 0;
+    if (str[0] == '-')
+        i = 1;
+    for (; str[i] != '.' && str[i]; i++)
+        integeralPart = integeralPart * 10 + (str[i] - 48);
+
+    if (strlen(str) != i)
+    {
+        for (i++; str[i]; i++)
+            decimalPart = decimalPart * 10 + (str[i] - 48);
+    }
+
+    int countDigits = 0, copyDecimalPart = decimalPart;
+    while (copyDecimalPart > 0)
+    {
+        countDigits++;
+        copyDecimalPart /= 10;
+    }
+    double digitsAfterPoint = 0;
+    if (countDigits)
+        digitsAfterPoint = decimalPart / pow(10, countDigits);
+
+    double num = integeralPart;
+    num += digitsAfterPoint;
+    if (str[0] == '-')
+        num = -num;
+    return num;
+}
+
+long long int getOnlyInteger()
+{
+    char str[30];
+    int i = 0;
+    while (1)
+    {
+        char ch = getch();
+        if (ch == ' ' || ch == 13)
+            break;
+        else if (ch >= '0' && ch <= '9' || ch == '-' && i == 0)
+        {
+            putch(ch);
+            str[i] = ch;
+            i++;
+        }
+        else if (ch == 8 && i > 0)
+        {
+            i--;
+            putch('\b');
+            putch(' ');
+            putch('\b');
+        }
+    }
+    str[i] = 0;
+    return (stringToInt(str));
+}
+
+long long int stringToInt(char *str)
+{
+    long long int integeralPart = 0;
+    int i = 0;
+    if (str[0] == '-')
+        i = 1;
+    for (; str[i]; i++)
+        integeralPart = integeralPart * 10 + (str[i] - 48);
+
+    if (str[0] == '-')
+        integeralPart = -integeralPart;
+    return integeralPart;
+}