algoritam za promenu malih slova

int main (int brArg, char *nizarg[]){
 FILE *f1 = fopen(nizarg[1], "r");
 FILE *f2 = fopen(nizarg[2], "w");

 char c;
 int brsug = 0;
 while (fscanf(f1, "%c", &c) !=EOF) {
    if (c>='a', && c<='z'){
        c-=32;
        if(c!='a' && c!='e' && c!='i' && c!='o' && c!='u')
            brsug++;
            }
        else if(c>='A', && c<='Z'){
        c-=32;
        if(c!='A' && c!='E' && c!='I' && c!='O' && c!='U')
            brsug++;
            }
        fprintf(f2, "%c", c);
        }
        fclose(f1);
        fclose(f2);