init decimal file

Author: kanishkratn

Any_Base_to_decimal

@@ -0,0 +1,40 @@
+#include <ctype.h>
+#include <stdio.h>
+
+int main(void)
+{
+ int base, i, j;
+ char number[100];
+ unsigned long decimal = 0;
+
+ printf("Enter the base: ");
+ scanf("%d", &base);
+ printf("Enter the number: ");
+ scanf("%s", &number[0]);
+
+ for (i = 0; number[i] != '\0'; i++)
+ {
+ if (isdigit(number[i]))
+ number[i] -= '0';
+ else if (isupper(number[i]))
+ number[i] -= 'A' - 10;
+ else if (islower(number[i]))
+ number[i] -= 'a' - 10;
+ else
+ number[i] = base + 1;
+
+ if (number[i] >= base)
+ {
+ printf("invalid number\n");
+ return 0;
+ }
+ }
+
+ for (j = 0; j < i; j++)
+ {
+ decimal *= base;
+ decimal += number[j];
+ }
+
+ printf("%lu\n", decimal);
+}