foo.c:1:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
foo.c: In function 'main':
foo.c:10:5: error: unknown type name 'bool'
foo.c:13:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
foo.c:13:13: warning: incompatible implicit declaration of built-in function 'scanf' [enabled by default]
foo.c:32:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
foo.c:32:13: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
foo.c:38:13: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
foo.c:44:13: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
foo.c:49:9: error: 'knapsack01' undeclared (first use in this function)
foo.c:49:9: note: each undeclared identifier is reported only once for each function it appears in
foo.c:63:9: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]