compare string strcmp() function with 2d pointer of string? - c

Question

i am doing code practicing which is below
int main() {
int N, Q, cnt;
scanf("%d", &N);
char **str1=(char**)malloc(sizeof(char*)*N);
for(int i=0; i<N; i++) {
str1[i]=(char*)malloc(sizeof(char)*20);
scanf("%[^\n]s", str1[i]);
}
scanf("%d", &Q);
char **str2=(char**)malloc(sizeof(char*)*Q);
for(int i=0; i<Q; i++) {
str2[i]=(char*)malloc(sizeof(char)*20);
scanf("%[^\n]s", str2[i]);
}
for(int i=0; i<Q; i++) {
for(int j=0, cnt=0; j<N; j++) {
// if statement
if( strcmp(str2[i], str1[j]) == 0) cnt++;
}
printf("%d\n", cnt);
}
for(int i=0; i<N; i++){
free(str1[i]);
}
for(int i=0; i<Q; i++) {
free(str2[i]);
}
free(str1);
free(str2);
return 0;
}
STD input are
4
aaa
bbb
ccc
aaa
3
aaa
bbb
cca
than print out
2
1
0
because
'aaa' is 2 times
'bbb' is 1 times
'cca' is 0 times
if( strcmp(str2[i], str1[j]) == 0) cnt++;
however the if statement, doesn't count cnt++
whats wrong, my code with strcmp() ?

Answer 1

You have two variables called cnt.
One declared on this line:
int N, Q, cnt;
and scoped to the entire function.
One declared on this line:
for(int j=0, cnt=0; j<N; j++) {
and scoped to the for loop.
The statement cnt++ modifies the second one since it's inside the for loop.
The statement printf("%d\n", cnt); prints the first one since it's outside the for loop.