I was investigating the use of magic numbers and I have simplified my experiment to the following program. I noticed that when I use the static analysis function in Xcode I get the message "Left operand of '==' is a garbage value" for the temp[4] comparison. Is this a false positive and if so why ?
#include <stdio.h>#include <stdlib.h>int main(int argc, char *argv[]){ FILE *input; if(!(input = fopen("unknown_video.ext", "rb"))) return(EXIT_FAILURE); int test_size = 10; int b = 0; int temp[test_size]; while(b < test_size) { if((temp[b] = fgetc(input)) == EOF) break; b++; } fclose(input); if((temp[0] == 'R') && (temp[1] == 'I') && (temp[2] == 'F') && (temp[3] == 'F')) { printf("RIFF\n"); } else if((temp[4] == 'f') && (temp[5] == 't') && (temp[6] == 'y') && (temp[7] == 'p')) { printf("QuickTime\n"); } return(EXIT_SUCCESS);}