integer extraction from string

Question

I have an input argument string const char* s I know that it starts the sequence of chars which are integers representation ,this sequence could be of any length ,

Answer 1

You can iterate through the string and can give the condition to get numbers

num=0;
for(i=0;str[i]!='\0';i++) {
if(str[i]>=48 && str[i]<=57)
 num=num*10+(str[i]-48);
  printf("\n%d",num);
}