while 循环

R 中级

Filip Schouwenaars

DataCamp Instructor

while 循环

while(condition) {
  expr
}

while(ctr <= 7) {
R 中级

while 循环

while(condition) {
  expr
}

while(ctr <= 7) {
  print(paste("ctr is set to", ctr))
R 中级

while 循环

while(condition) {
  expr
}

while(ctr <= 7) {
  print(paste("ctr is set to", ctr))
  ctr <- ctr + 1
}
R 中级

while 循环

while(condition) {
  expr
}

while(ctr <= 7) {
  print(paste("ctr is set to", ctr))
  ctr <- ctr + 1
}

"ctr is set to 1"
R 中级

while 循环

while(condition) {
  expr
}

while(ctr <= 7) {
  print(paste("ctr is set to", ctr))
  ctr <- ctr + 1
}

"ctr is set to 2"
R 中级

while 循环

while(condition) {
  expr
}

while(ctr <= 7) {
  print(paste("ctr is set to", ctr))
  ctr <- ctr + 1
}

"ctr is set to 7"
R 中级

while 循环

while(condition) {
  expr
}

while(ctr <= 7) {
  print(paste("ctr is set to", ctr))
  ctr <- ctr + 1
}
  • 无输出
R 中级

while 循环

ctr <- 1
while(ctr <= 7) {
  print(paste("ctr is set to", ctr))
  ctr <- ctr + 1
}

"ctr is set to 1"
"ctr is set to 2"
...
"ctr is set to 7"

ctr

8
R 中级

while 循环

ctr <- 1
while(ctr <= 7) {
  print(paste("ctr is set to", ctr))
  ctr <- ctr + 1
}
R 中级

无限 while 循环

ctr <- 1
while(ctr <= 7) {
  print(paste("ctr is set to", ctr))

}

"ctr is set to 1"
"ctr is set to 1"
"ctr is set to 1"
"ctr is set to 1"
"ctr is set to 1"
"ctr is set to 1"
"ctr is set to 1"
...
R 中级

break 语句

ctr <- 1
while(ctr <= 7) {
  if(ctr %% 5 == 0) {
    break
  }
  print(paste("ctr is set to", ctr))
  ctr <- ctr + 1
}

"ctr is set to 1"
"ctr is set to 2"
"ctr is set to 3"
"ctr is set to 4"
R 中级

Vamos praticar!

R 中级

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