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  1. #include <stdio.h>
  2. #include <math.h>
  3. #include <string.h>
  4.  
  5. int main()
  6. {
  7.  
  8.     char s[40];
  9.     int base;
  10.     int index,n,p,sum=0;     /* n is the number of digits in the converted value */
  11.  
  12.     printf("enter the number and base: ");
  13.     scanf("%s %d",s,&base);
  14.     printf("\nYou entered %s %d\n", s, base);
  15.  
  16.     p=strlen(s)-1;
  17.     for(index=0; index < strlen(s); index++, p--)
  18.     {
  19.         sum += (s[index]-'0') * pow(base,p);
  20.     }
  21.     printf("decimal no. is %d\n",sum);
  22.     return 0;
  23.  
  24. }
Success #stdin #stdout 0s 1792KB
comments ()
stdin
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1101 2
stdout
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enter the number and base: 
You entered 1101 2
decimal no. is 13
https://ideone.com/wVwqPN
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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