for loop - C - error after for() cicle -


i've been coding in c solve problem in rosalind's website. code simple, , because it's simple, it's hard correct error.(i guess) here code:

    /* string ordered collection of symbols selected alphabet , formed word; length of string number of symbols contains.  example of length 21 dna string (whose alphabet contains symbols 'a', 'c', 'g', , 't') "atgcttcagaaaggtcttacg."  given: dna string s of length @ 1000 nt.  return: 4 integers (separated spaces) counting respective number of times symbols 'a', 'c', 'g', , 't' occur in s. */  #include <stdio.h>  int main(){     char nt;     int na, nc, ng, nt;     for(int = 0, na = nc = ng = nt = 0; < 1000; i++){         nt = getchar();         if(nt == 'a'){             na++;         }else if(nt == 'c'){             nc++;         }else if(nt == 'g'){             ng++;         }else if(nt == 't'){             nt++;         }else{             break;         }     }     printf(" %d %d %d %d", na, nc, ng, nt); }

and when test code:

agcttttcattctgactgcaacgggcaatatgtctctgtgtggattaaaaaaagagtgtctgatagcagc

it should give:

20 12 17 21

but computer gives:

4200624 12 17 21

i've put printf() functions find error located. i've seen in moment right before getting out of cicle na = 20, moment right after na = 4200624 . can do?

i believe due fact redeclaring variables in header, set variable 0. since declare na right after i, have created new variable same name, different scope. 1 visible in loop itself, destroyed after ends. other variables initialised due chain of assignments. i.e. initialised, not redeclared. initialising variables in same line have declared them, solve issue.


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