Compilare: main.c: In function 'main': main.c:22:65: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration] freopen("swap.in","r",stdin),freopen("swap.out","w",stdout),gets(s),gets(t),n=strlen(s); ^~~~ main.c:22:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("swap.in","r",stdin),freopen("swap.out","w",stdout),gets(s),gets(t),n=strlen(s); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:22:34: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("swap.in","r",stdin),freopen("swap.out","w",stdout),gets(s),gets(t),n=strlen(s); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./ccGCaP25.o: In function `main': main.c:(.text.startup+0x3a): warning: the `gets' function is dangerous and should not be used.