foo.c: In function 'main':
foo.c:8:13: warning: assignment to 'char' from 'char *' makes integer from pointer without a cast [-Wint-conversion]
    8 |         if(c="+")
      |             ^
foo.c:8:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    8 |         if(c="+")
      |            ^

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