foo.c: In function 'main':
foo.c:8:5: warning: implicit declaration of function 'swich' [-Wimplicit-function-declaration]
    8 |     swich(b){
      |     ^~~~~
foo.c:8:13: error: expected ';' before '{' token
    8 |     swich(b){
      |             ^
      |             ;
foo.c:5:23: warning: unused variable 'd' [-Wunused-variable]
    5 |         long long a,c,d;
      |                       ^

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