foo.c: In function 'F':
foo.c:11:6: warning: unused variable 'i' [-Wunused-variable]
int i, j;
^
foo.c: In function 'mul':
foo.c:29:6: warning: unused variable 't' [-Wunused-variable]
int t;
^
foo.c: In function 'main':
foo.c:53:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &x1, &n1);
^~~~~~~~~~~~~~~~~~~~~~~~
foo.c:54:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &x2, &n2);
^~~~~~~~~~~~~~~~~~~~~~~~
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