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Lab9/Task3.C

+#include <stdio.h>
+#include <string.h>
+int ident(char str[5]);
+int convertToInteger(char str[5]);
+
+int main()
+{
+
+    char input[5];
+    int count = 0;
+    do
+    {
+        if (count > 0)
+        {
+            printf("This is not a number!\n");
+        }
+        puts("Enter a 5 digit number: ");
+        scanf("%s", input);
+        printf("String: %s", input);
+        printf("\n");
+        count++;
+    } while (ident(input) != 5);
+
+    printf("Integer: %d\n", convertToInteger(input));
+    return 0;
+}
+
+int ident(char str[5])
+{
+    int flag;
+    int result = 0;
+    for (int i = 0; i < 5; i++)
+    {
+        flag = 0;
+        for (int j = 48; j <= 57; j++)
+        {
+            if (str[i] == j)
+            {
+                flag = 1;
+                break;
+            }
+        }
+        result = result + flag;
+    }
+
+    return result;
+}
+
+int convertToInteger(char str[5])
+{
+    int i, len;
+    int result = 0;
+    len = 5;
+    for (i = 0; i < len; i++)
+    {
+        result = result * 10 + (str[i] - '0');
+    }
+
+    return result;
+}