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="+")
| ^
foo.c:10:13: warning: assignment to 'char' from 'char *' makes integer from pointer without a cast [-Wint-conversion]
10 | if(c="-")
| ^
foo.c:10:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
10 | if(c="-")
| ^
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