This is one approach:
FILE* myfile = fopen("test.txt", "r");
int ch, number_of_lines = 0;
do
{
ch = fgetc(myfile);
if(ch == '
')
number_of_lines++;
} while (ch != EOF);
// last line doesn't end with a new line!
// but there has to be a line at least before the last line
if(ch != '
' && number_of_lines != 0)
number_of_lines++;
fclose(myfile);
printf("number of lines in test.txt = %d", number_of_lines);
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