if else语句使用格式
1.
if (test) {
statement
}
2.
if (test) {
statement
} else {
statement
}
3.
if ( test) {
statement
} else if ( test) {
statement
} else if ( test) {
statement
} else {
statement
}
species=sample(c("human","mouse","rat"),1)
species
if(species=="human"){
Annotated_data="org.Hs.eg.db"
Abbreviation="hsa"
print("human information")
}else if(species=="mouse"){
Annotated_data="org.Mm.eg.db"
Abbreviation="mmu"
print("mouse information")
}else if(species=="rat"){
Annotated_data="org.Rn.eg.db"
Abbreviation="rno"
print("rat information")
}else{
print("end up")
}
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