foo.c: In function 'main':
foo.c:7:1: warning: statement with no effect [-Wunused-value]
 for(min; min<=max; min++)
 ^~~
foo.c:4:5: warning: unused variable 'i' [-Wunused-variable]
 int i,sum=0;
     ^
foo.c:6:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d",&min,&max);
 ^~~~~~~~~~~~~~~~~~~~~~~

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